How to change the style for the SelectedItem of the ItemsView control in WinUI3?

Question

I am working with ItemsView for a while. I wanted to change the selecteditem's style and hoverstyle for the remaining items.

The unwanted thin lines are displaying on the right side and bottom of the selected Item. How to remove those?.

<ItemContainer CornerRadius="15" Padding="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
    <Border x:Name="CategoryBorder" IsTabStop="False" BorderThickness="8" CornerRadius="15" Margin="0,0,0,0" BorderBrush="Transparent" Background="{Binding BackgroundColor}">
        <StackPanel IsTabStop="False" Orientation="Vertical" Margin="12,10,0,0" VerticalAlignment="Top" HorizontalAlignment="Left">
            <TextBlock Name="CategoryName" Text="{Binding Name}" TextWrapping="WrapWholeWords" FontWeight="SemiBold" Margin="0,0,10,10" FontSize="16" MaxLines="2"/>
        </StackPanel>
    </Border>
</ItemContainer>

Is there any way to change the style of the ItemsView's ItemContainer as per our needs?

Andrew KeepCoding · Accepted Answer · 2025-05-16 13:43:22Z

Try restyling the ItemsContainer.

You'll find VisualStates like UnselectedNormal, UnselectedPointerOver.

Here's the entire style from the generic.xaml. Note that you might need to remove some unnecessary namespaces like controls:.

<Style TargetType="ItemContainer">
    <Setter Property="Background" Value="{ThemeResource ItemContainerBackground}" />
    <Setter Property="UseSystemFocusVisuals" Value="True" />
    <Setter Property="FocusVisualPrimaryThickness" Value="2" />
    <Setter Property="CornerRadius" Value="{ThemeResource ControlCornerRadius}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ItemContainer">
                <Grid x:Name="PART_ContainerRoot" Background="{TemplateBinding Background}" CornerRadius="{TemplateBinding CornerRadius}">

                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CombinedStates">
                            <VisualState x:Name="UnselectedNormal" />
                            <VisualState x:Name="UnselectedPointerOver">

                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Fill">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerPointerOverBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Stroke">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerPointerOverBorderBrush}" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="UnselectedPressed">

                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Fill">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerPressedBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Stroke">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerPressedBorderBrush}" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="SelectedNormal">

                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="BorderBrush">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectionVisualBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Fill">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Stroke">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerBorderBrush}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Margin">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerMargin}" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="SelectedPointerOver">

                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="Opacity">
                                        <SplineDoubleKeyFrame KeyTime="{StaticResource ControlFastAnimationDuration}" Value="1" KeySpline="0,0,0,1" />
                                    </DoubleAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Fill">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedPointerOverBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="BorderBrush">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectionVisualPointerOverBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Stroke">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerBorderBrush}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Margin">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerMargin}" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="SelectedPressed">

                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="Opacity">
                                        <SplineDoubleKeyFrame KeyTime="{StaticResource ControlFastAnimationDuration}" Value="1" KeySpline="0,0,0,1" />
                                    </DoubleAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Fill">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedPressedBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="BorderBrush">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectionVisualPressedBackground}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Stroke">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerBorderBrush}" />
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CommonVisual" Storyboard.TargetProperty="Margin">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ItemContainerSelectedInnerMargin}" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>

                        </VisualStateGroup>

                        <VisualStateGroup x:Name="MultiSelectStates">
                            <VisualState x:Name="Single" />
                            <VisualState x:Name="Multiple">

                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionCheckbox" Storyboard.TargetProperty="Opacity">
                                        <SplineDoubleKeyFrame KeyTime="{StaticResource ControlFastAnimationDuration}" Value="1" KeySpline="0,0,0,1" />
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>

                        </VisualStateGroup>

                        <VisualStateGroup x:Name="DisabledStates">
                            <VisualState x:Name="Enabled" />

                            <VisualState x:Name="Disabled">

                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_ContainerRoot" Storyboard.TargetProperty="Opacity">
                                        <SplineDoubleKeyFrame KeyTime="{StaticResource ControlFastAnimationDuration}" Value="{StaticResource ItemContainerDisabledOpacity}" KeySpline="0,0,0,1" />
                                    </DoubleAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_SelectionVisual" Storyboard.TargetProperty="Visibility">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed" />
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>

                        </VisualStateGroup>

                    </VisualStateManager.VisualStateGroups>
                    <!--Placeholder for child -->
                    <Grid x:Name="PART_SelectionVisual" x:DeferLoadStrategy="Lazy" BorderBrush="Transparent" BorderThickness="3" Background="Transparent" CornerRadius="{TemplateBinding CornerRadius}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" IsHitTestVisible="False" Opacity="0" />
                    <Rectangle x:Name="PART_CommonVisual" Stroke="{ThemeResource ItemContainerBorderBrush}" StrokeThickness="{ThemeResource ItemContainerSelectedInnerThickness}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" IsHitTestVisible="False" RadiusX="{Binding CornerRadius, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource TopLeftCornerRadiusDoubleValueConverter}}" RadiusY="{Binding CornerRadius, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource BottomRightCornerRadiusDoubleValueConverter}}" />
                    <CheckBox x:Name="PART_SelectionCheckbox" Style="{StaticResource ItemContainerSelectionCheckboxStyle}" x:DeferLoadStrategy="Lazy" Opacity="0">
                        <CheckBox.Resources>
                            <StaticResource x:Key="CheckBoxCheckBackgroundFillUnchecked" ResourceKey="ControlOnImageFillColorDefaultBrush" />
                        </CheckBox.Resources>
                    </CheckBox>

                </Grid>

            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

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