The Picker icon is not appearing in .NET MAUI on Windows 11.

Question

The Picker icon is not appearing in .NET MAUI on Windows 11.

Sowndarrajan Vijayaragavan 470

.NET 8Installed Workload Id Manifest Version Installation Source

android 35.0.39/9.0.100 SDK 9.0.100, VS 17.12.35527.113

aspire 8.2.2/8.0.100 SDK 9.0.100, VS 17.12.35527.113

ios 18.2.9173/9.0.100 SDK 9.0.100, VS 17.12.35527.113

maccatalyst 18.2.9173/9.0.100 SDK 9.0.100, VS 17.12.35527.113

maui 9.0.14/9.0.100 SDK 9.0.100

maui-windows 9.0.14/9.0.100 SDK 9.0.100, VS 17.12.35527.113

In windows 11 It is not working

Edition Windows 11 Enterprise Version 23H2 Installed on ‎3/‎11/‎2025 OS build 22631.4890 Experience Windows Feature Experience Pack 1000.22700.1067.0

The Picker icon is not appearing in .NET MAUI on Windows 11.




<Border HorizontalOptions="Center" VerticalOptions="Start" Grid.Column="0" ZIndex="1" WidthRequest="65" HeightRequest="30" Stroke="Gray" >
 <Border.StrokeShape>
 <RoundRectangle CornerRadius="5,0,0,5"/>
 </Border.StrokeShape>
 <HorizontalStackLayout>
 <Label Text="Picker" FontSize="Caption" FontAttributes="Bold"/>
 <Picker  WidthRequest="350" HorizontalOptions="StartAndExpand"  VerticalOptions="Center">    <Picker.Items>
 <x:String>Item 1</x:String>
 <x:String>Item 2</x:String>
 <x:String>Item 3</x:String>
 <x:String>Item 4</x:String>
 <x:String>Item 5</x:String>
 </Picker.Items>
 </Picker>
 </HorizontalStackLayout>
 </Border>

User's image

Here is style.xml

        <Style TargetType="ComboBox">

            <Setter Property="BorderThickness" Value="0"/>

            <Setter Property="Padding" Value="0,0,0,10"/>

            <Setter Property = "MaxDropDownHeight" Value="250"/>

            <Setter Property="Foreground" Value="{ThemeResource ComboBoxForeground}" />

            <Setter Property="Background" Value="{ThemeResource ComboBoxBackground}" />

            <Setter Property="BorderBrush" Value="{ThemeResource ComboBoxBorderBrush}" />

            <Setter Property="TabNavigation" Value="Once" />

            <Setter Property="TextBoxStyle" Value="{StaticResource ComboBoxTextBoxStyle}" />

            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />

            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />

            <Setter Property="ScrollViewer.HorizontalScrollMode" Value="Disabled" />

            <Setter Property="ScrollViewer.VerticalScrollMode" Value="Auto" />

            <Setter Property="ScrollViewer.IsVerticalRailEnabled" Value="True" />

            <Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" />

            <Setter Property="ScrollViewer.BringIntoViewOnFocusChange" Value="True" />

            <Setter Property="HorizontalContentAlignment" Value="Stretch" />

            <Setter Property="HorizontalAlignment" Value="Left" />

            <Setter Property="VerticalAlignment" Value="Top" />

            <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />

            <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />

            <Setter Property="UseSystemFocusVisuals" Value="{ThemeResource IsApplicationFocusVisualKindReveal}" />

            <Setter Property="ItemsPanel">

                <Setter.Value>

                    <ItemsPanelTemplate>

                        <CarouselPanel />

                    </ItemsPanelTemplate>

                </Setter.Value>

            </Setter>

            <Setter Property="Template">

                <Setter.Value>

                    <ControlTemplate TargetType="ComboBox">

                        <Grid x:Name="LayoutRoot">

                            <Grid.Resources>

                                <Storyboard x:Key="OverlayOpeningAnimation">

                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">

                                        <DiscreteDoubleKeyFrame KeyTime="0:0:0" Value="0.0" />

                                        <SplineDoubleKeyFrame KeyTime="0:0:0.383" KeySpline="0.1,0.9 0.2,1.0" Value="1.0" />

                                    </DoubleAnimationUsingKeyFrames>

                                </Storyboard>

                                <Storyboard x:Key="OverlayClosingAnimation">

                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">

                                        <DiscreteDoubleKeyFrame KeyTime="0:0:0" Value="1.0" />

                                        <SplineDoubleKeyFrame KeyTime="0:0:0.216" KeySpline="0.1,0.9 0.2,1.0" Value="0.0" />

                                    </DoubleAnimationUsingKeyFrames>

                                </Storyboard>

                            </Grid.Resources>

                            <VisualStateManager.VisualStateGroups>

                                <VisualStateGroup x:Name="CommonStates">

                                    <VisualState x:Name="Normal" />

                                    <VisualState x:Name="PointerOver">

                                        <Storyboard>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Background">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundPointerOver}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="BorderBrush">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBorderBrushPointerOver}" />

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                    <VisualState x:Name="Pressed">

                                        <Storyboard>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Background">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundPressed}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="BorderBrush">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBorderBrushPressed}" />

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                    <VisualState x:Name="Disabled">

                                        <Storyboard>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Background">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundDisabled}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="BorderBrush">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBorderBrushDisabled}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HeaderContentPresenter" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundDisabled}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundDisabled}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextBlock" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource ComboBoxForegroundDisabled}}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DropDownGlyph" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundDisabled}" />

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                </VisualStateGroup>

                                <VisualStateGroup x:Name="FocusStates">

                                    <VisualState x:Name="Focused">

                                        <Storyboard>

                                            <DoubleAnimation Storyboard.TargetName="HighlightBackground"

                    Storyboard.TargetProperty="Opacity"

                    To="1"

                    Duration="0" />

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HighlightBackground" Storyboard.TargetProperty="BorderBrush">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundBorderBrushFocused}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundFocused}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextBlock" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource ComboBoxForegroundFocused}}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DropDownGlyph" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundFocused}" />

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                    <VisualState x:Name="FocusedPressed">

                                        <Storyboard>

                                            <DoubleAnimation Storyboard.TargetName="HighlightBackground"

                    Storyboard.TargetProperty="Opacity"

                    To="1"

                    Duration="0" />

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundFocusedPressed}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextBlock" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource ComboBoxPlaceHolderForegroundFocusedPressed}}" />

                                            </ObjectAnimationUsingKeyFrames>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DropDownGlyph" Storyboard.TargetProperty="Foreground">

                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundFocusedPressed}" />

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                    <VisualState x:Name="Unfocused" />

                                    <VisualState x:Name="PointerFocused" />

                                    <VisualState x:Name="FocusedDropDown">

                                        <Storyboard>

                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PopupBorder" Storyboard.TargetProperty="Visibility" Duration="0">

                                                <DiscreteObjectKeyFrame KeyTime="0">

                                                    <DiscreteObjectKeyFrame.Value>

                                                        <Visibility>Visible</Visibility>

                                                    </DiscreteObjectKeyFrame.Value>

                                                </DiscreteObjectKeyFrame>

                                            </ObjectAnimationUsingKeyFrames>

                                        </Storyboard>

                                    </VisualState>

                                </VisualStateGroup>

                                <VisualStateGroup x:Name="DropDownStates">

                                    <VisualState x:Name="Opened">

                                        <Storyboard>

                                            <SplitOpenThemeAnimation OpenedTargetName="PopupBorder"

                ClosedTargetName="ContentPresenter"

                OffsetFromCenter="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DropDownOffset}"

                OpenedLength="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DropDownOpenedHeight}" />

                                        </Storyboard>

                                    </VisualState>

                                    <VisualState x:Name="Closed">

                                        <Storyboard>

                                            <SplitCloseThemeAnimation OpenedTargetName="PopupBorder"

                ClosedTargetName="ContentPresenter"

                OffsetFromCenter="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DropDownOffset}"

                OpenedLength="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DropDownOpenedHeight}" />

                                        </Storyboard>

                                    </VisualState>

                                </VisualStateGroup>

                                <VisualStateGroup x:Name="EditableModeStates">

                                    <VisualState x:Name="TextBoxFocused">

                                        <VisualState.Setters>

                                            <Setter Target="DropDownGlyph.Foreground" Value="{ThemeResource ComboBoxEditableDropDownGlyphForeground}" />

                                            <Setter Target="DropDownOverlay.Margin" Value="0,3,2,2" />

                                        </VisualState.Setters>

                                    </VisualState>

                                    <VisualState x:Name="TextBoxFocusedOverlayPointerOver">

                                        <VisualState.Setters>

                                            <Setter Target="DropDownGlyph.Foreground" Value="{ThemeResource ComboBoxEditableDropDownGlyphForeground}" />

                                            <Setter Target="DropDownOverlay.Background" Value="{ThemeResource ComboBoxFocusedDropDownBackgroundPointerOver}" />

                                            <Setter Target="DropDownOverlay.Margin" Value="0,3,2,2" />

                                        </VisualState.Setters>

                                    </VisualState>

                                    <VisualState x:Name="TextBoxFocusedOverlayPressed">

                                        <VisualState.Setters>

                                            <Setter Target="DropDownGlyph.Foreground" Value="{ThemeResource ComboBoxEditableDropDownGlyphForeground}" />

                                            <Setter Target="DropDownOverlay.Background" Value="{ThemeResource ComboBoxFocusedDropDownBackgroundPointerPressed}" />

                                            <Setter Target="DropDownOverlay.Margin" Value="0,3,2,2" />

                                        </VisualState.Setters>

                                    </VisualState>

                                    <VisualState x:Name="TextBoxOverlayPointerOver">

                                        <VisualState.Setters>

                                            <Setter Target="DropDownOverlay.Background" Value="{ThemeResource ComboBoxDropDownBackgroundPointerOver}" />

                                        </VisualState.Setters>

                                    </VisualState>

                                    <VisualState x:Name="TextBoxOverlayPressed">

                                        <VisualState.Setters>

                                            <Setter Target="DropDownOverlay.Background" Value="{ThemeResource ComboBoxDropDownBackgroundPointerPressed}" />

                                        </VisualState.Setters>

                                    </VisualState>

                                    <VisualState x:Name="TextBoxUnfocused" />

                                </VisualStateGroup>

                            </VisualStateManager.VisualStateGroups>

                            <Grid.RowDefinitions>

                                <RowDefinition Height="Auto" />

                                <RowDefinition Height="*" />

                                <RowDefinition Height="Auto" />

                            </Grid.RowDefinitions>

                            <Grid.ColumnDefinitions>

                                <ColumnDefinition Width="*" />

                                <ColumnDefinition Width="32" />

                            </Grid.ColumnDefinitions>

                            <ContentPresenter x:Name="HeaderContentPresenter"

            Grid.Row="0"

            Grid.Column="0"

            Grid.ColumnSpan="2"

            Content="{TemplateBinding Header}"

            ContentTemplate="{TemplateBinding HeaderTemplate}"

            FlowDirection="{TemplateBinding FlowDirection}"

            FontWeight="{ThemeResource ComboBoxHeaderThemeFontWeight}"

            Margin="{ThemeResource ComboBoxTopHeaderMargin}"

            TextWrapping="Wrap"

            VerticalAlignment="Top"

            Visibility="Collapsed"

            x:DeferLoadStrategy="Lazy" />

                            <Border x:Name="Background"

            Grid.Row="1"

            Grid.Column="0"

            Grid.ColumnSpan="2"

            Background="{TemplateBinding Background}"

            BorderBrush="{TemplateBinding BorderBrush}"

            BorderThickness="{TemplateBinding BorderThickness}"

            CornerRadius="{TemplateBinding CornerRadius}"

            Control.IsTemplateFocusTarget="True"

            MinWidth="{ThemeResource ComboBoxThemeMinWidth}" />

                            <Border x:Name="HighlightBackground"

            Grid.Row="1"

            Grid.Column="0"

            Grid.ColumnSpan="2"

            Background="{ThemeResource ComboBoxBackgroundUnfocused}"

            BorderBrush="{ThemeResource ComboBoxBackgroundBorderBrushUnfocused}"

            BorderThickness="{TemplateBinding BorderThickness}"

            CornerRadius="{TemplateBinding CornerRadius}"

            Opacity="0" />

                            <ContentPresenter x:Name="ContentPresenter"

            Grid.Row="1"

            Grid.Column="0"

            Margin="{TemplateBinding Padding}"

            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"

            VerticalAlignment="{TemplateBinding VerticalContentAlignment}">

                                <TextBlock x:Name="PlaceholderTextBlock"

              Text="{TemplateBinding PlaceholderText}"

              Foreground="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource ComboBoxPlaceHolderForeground}}" />

                            </ContentPresenter>

                            <TextBox x:Name="EditableText"

            Grid.Row="1"

            Grid.Column="0"

            Grid.ColumnSpan="2"

            Style="{StaticResource ComboBoxTextBoxStyle}"

            Margin="0,0,0,0"

            Padding="10,3,30,5"

            BorderBrush="Transparent"

            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"

            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"

            PlaceholderText="{TemplateBinding PlaceholderText}"

            Foreground="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource ComboBoxPlaceHolderForeground}}"

            Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

            Visibility="Collapsed"

            Header="{TemplateBinding Header}"

            AutomationProperties.Name="{TemplateBinding AutomationProperties.Name}"

            x:Load="False"/>

                            <Border x:Name="DropDownOverlay"

            Grid.Row="1"

            Grid.Column="1"

            Background="Transparent"

            Margin="0,2,2,2"

            Visibility="Collapsed"

            Width="30"

            HorizontalAlignment="Right"

            x:Load="False"/>

                            <FontIcon x:Name="DropDownGlyph"

            Grid.Row="1"

            Grid.Column="1"

            IsHitTestVisible="False"

            Margin="0,6,10,10"

            Foreground="{ThemeResource ComboBoxDropDownGlyphForeground}"

            FontFamily="{ThemeResource SymbolThemeFontFamily}"

            FontSize="16"

            Glyph="&#x25BC;"

            HorizontalAlignment="Right"

            VerticalAlignment="Center"

            AutomationProperties.AccessibilityView="Raw" />

                            <ContentPresenter x:Name="DescriptionPresenter"

            Grid.Row="2"

            Grid.Column="0"

            Grid.ColumnSpan="2"

            Foreground="{ThemeResource SystemControlDescriptionTextForegroundBrush}"

            Content="{TemplateBinding Description}"

            x:Load="False"/>

                            <Popup x:Name="Popup">

                                <Border x:Name="PopupBorder"

              Background="{ThemeResource ComboBoxDropDownBackground}"

              BackgroundSizing="OuterBorderEdge"

              BorderBrush="{ThemeResource ComboBoxDropDownBorderBrush}"

              BorderThickness="{ThemeResource ComboBoxDropdownBorderThickness}"

              Margin="0,-1,0,-1"

              Padding="{ThemeResource ComboBoxDropdownBorderPadding}"

              HorizontalAlignment="Stretch">

                                    <ScrollViewer x:Name="ScrollViewer"

                Foreground="{ThemeResource ComboBoxDropDownForeground}"

                MinWidth="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DropDownContentMinWidth}"

                VerticalSnapPointsType="OptionalSingle"

                VerticalSnapPointsAlignment="Near"

                HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"

                HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"

                VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"

                VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"

                IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}"

                IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}"

                IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}"

                BringIntoViewOnFocusChange="{TemplateBinding ScrollViewer.BringIntoViewOnFocusChange}"

                ZoomMode="Disabled"

                AutomationProperties.AccessibilityView="Raw">

                                        <ItemsPresenter Margin="{ThemeResource ComboBoxDropdownContentMargin}" />

                                    </ScrollViewer>

                                </Border>

                            </Popup>

                        </Grid>

                    </ControlTemplate>

                </Setter.Value>

            </Setter>

        </Style>

Anonymous

2025-03-27T02:03:20.3166667+00:00

You can find <FontIcon x:Name="DropDownGlyph"> in above style. then change the Glyph="▼" to Glyph="". This icon will appear.

By the way, if you want to custom controls for windows platform. you can refer to this generic.xaml for 1.7 version, it is latest version.

1 answer

Your answer

Anonymous

2025-03-27T02:03:20.3166667+00:00

You can find <FontIcon x:Name="DropDownGlyph"> in above style. then change the Glyph="▼" to Glyph="". This icon will appear.

By the way, if you want to custom controls for windows platform. you can refer to this generic.xaml for 1.7 version, it is latest version.

Answer 1

Hello,

Based on the provided ControlTemplate, the dropdown icon is not displaying due to the specified glyph in the FontIcon not being available in the assigned font family.

The FontIcon is configured with Glyph="▼" (Unicode character U+25BC, black down-pointing triangle) and FontFamily="{ThemeResource SymbolThemeFontFamily}".
The SymbolThemeFontFamily resolves to an icon-specific font (such as Segoe MDL2 Assets or Segoe Fluent Icons), which primarily contains glyphs in private-use code points (e.g., E7xx or Fxxx) and does not support general Unicode characters like U+25BC. Consequently, the glyph fails to render.

Recommended Solutions

Utilize a standard text glyph with the default UI font (Segoe UI supports U+25BC)

Replace the FontIcon with a TextBlock as follows:

  <TextBlock x:Name="DropDownGlyph"
              Grid.Row="1"
              Grid.Column="1"
              Text="&#x25BC;"
              FontSize="16"
              Margin="0,6,10,10"
              Foreground="{ThemeResource ComboBoxDropDownGlyphForeground}"
              HorizontalAlignment="Right"
              VerticalAlignment="Center"
              IsHitTestVisible="False"
              AutomationProperties.AccessibilityView="Raw" />

Employ an appropriate icon font and code point

For a classic chevron using Segoe MDL2 Assets with code point E70D:

  <FontIcon x:Name="DropDownGlyph"
              Grid.Row="1"
              Grid.Column="1"
              Glyph="&#xE70D;"
              FontFamily="Segoe MDL2 Assets"
              FontSize="16"
              Margin="0,6,10,10"
              Foreground="{ThemeResource ComboBoxDropDownGlyphForeground}"
              HorizontalAlignment="Right"
              VerticalAlignment="Center"
              IsHitTestVisible="False"
              AutomationProperties.AccessibilityView="Raw" />

If retaining SymbolThemeFontFamily, ensure the Glyph corresponds to a valid code point in that font (avoiding U+25BC).

I hope this helps resolve your issue.

References

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The Picker icon is not appearing in .NET MAUI on Windows 11.

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