Shaker/Avalonia/SukiUI/Controls/SukiStackPage.axaml

<ResourceDictionary xmlns="https://github.com/avaloniaui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:SukiUI.Controls">
    <ControlTheme x:Key="SukiStackPageStyle" TargetType="controls:SukiStackPage">
        <Setter Property="Template">
            <ControlTemplate>
                <DockPanel Margin="40,20">
                    <StackPanel DockPanel.Dock="Top">
                        <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Disabled">
                            <StackPanel Name="StackHeader"
                                        HorizontalAlignment="Left"
                                        Orientation="Horizontal" />
                        </ScrollViewer>
                        <Border Height="1"
                                Margin="0,-20,0,0"
                                Background="{DynamicResource SukiControlBorderBrush}" />
                    </StackPanel>
                    <ContentPresenter Content="{TemplateBinding Content}" />
                </DockPanel>
            </ControlTemplate>
        </Setter>
    </ControlTheme>
    <ControlTheme x:Key="{x:Type controls:SukiStackPage}"
                  BasedOn="{StaticResource SukiStackPageStyle}"
                  TargetType="controls:SukiStackPage" />
</ResourceDictionary>