xaml Layout controls RelativePanel

Example

RelativePanel has been introduced in Windows 10 and is used mainly to support adaptive layouts, where the child elements of the panel are laid out differently depending on available space. RelativePanel is typically used with visual states, which are used to switch the layout configuration, adapting to the screen or window size, orientation or use case. The child elements use attached properties that define where they are in relation to the panel and each other.

<RelativePanel
    VerticalAlignment="Stretch"
    HorizontalAlignment="Stretch">
    <Rectangle
        x:Name="rectangle1"
        RelativePanel.AlignLeftWithPanel="True"
        Width="360"
        Height="50"
        Fill="Red"/>
    <Rectangle
        x:Name="rectangle2"
        RelativePanel.Below="rectangle1"
        Width="360"
        Height="50"
        Fill="Green" />
</RelativePanel>
<VisualStateManager.VisualStateGroups>
    <VisualStateGroup>
        <VisualState>
            <VisualState.StateTriggers>
                <!--VisualState to be triggered when window width is >=720 effective pixels.-->
                <AdaptiveTrigger
                    MinWindowWidth="720" />
            </VisualState.StateTriggers>
            <VisualState.Setters>
                <Setter
                    Target="rectangle2.(RelativePanel.Below)"
                    Value="{x:Null}" />
                <Setter
                    Target="rectangle2.(RelativePanel.RightOf)"
                    Value="rectangle1" />
                <Setter
                    Target="rectangle1.(RelativePanel.AlignLeftWithPanel)"
                    Value="False" />
                <Setter
                    Target="rectangle1.(RelativePanel.AlignVerticalCenterWithPanel)"
                    Value="True" />
                <Setter
                    Target="rectangle2.(RelativePanel.AlignVerticalCenterWithPanel)"
                    Value="True" />
            </VisualState.Setters>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>