Shaker/Avalonia/SukiUI.Dock/DocumentControl.axaml

<ResourceDictionary xmlns="https://github.com/avaloniaui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:suki="https://github.com/kikipoulet/SukiUI"
                    xmlns:core="using:Dock.Model.Core"
                    xmlns:dmc="using:Dock.Model.Controls">
    <Design.PreviewWith>
        <DocumentControl Width="300" Height="400" />
    </Design.PreviewWith>

    <ControlTheme x:Key="{x:Type DocumentControl}" TargetType="DocumentControl">

        <Setter Property="HeaderTemplate">
            <DataTemplate DataType="core:IDockable">
                <TextBlock Padding="2" Text="{Binding Title}" />
            </DataTemplate>
        </Setter>

        <Setter Property="Template">
            <ControlTemplate>

                <suki:GlassCard Margin="5" Padding="12,15">
                    <DockPanel x:Name="PART_DockPanel"
                               x:CompileBindings="True"
                               x:DataType="dmc:IDocumentDock"
                               Background="Transparent"
                               DockProperties.IsDockTarget="True"
                               DockProperties.IsDropArea="True"
                               ZIndex="1">
                        <DocumentTabStrip x:Name="PART_TabStrip"
                                          CanCreateItem="{Binding CanCreateDocument}"
                                          DockPanel.Dock="Top"
                                          DockProperties.IsDropArea="True"
                                          IsActive="{TemplateBinding IsActive}"
                                          ItemsSource="{Binding VisibleDockables}"
                                          SelectedItem="{Binding ActiveDockable, Mode=TwoWay}">
                            <DocumentTabStrip.Styles>
                                <Style Selector="DocumentTabStripItem">
                                    <Setter Property="IsActive" Value="{Binding $parent[DocumentTabStrip].IsActive}" />
                                </Style>
                            </DocumentTabStrip.Styles>
                        </DocumentTabStrip>
                        <Grid x:Name="PART_Grid" IsVisible="{Binding #PART_TabStrip.IsVisible}" />
                        <Border x:Name="PART_Border">
                            <DockableControl DataContext="{Binding ActiveDockable}" TrackingMode="Visible">
                                <ContentControl x:Name="PART_ContentPresenter"
                                                HorizontalAlignment="Stretch"
                                                VerticalAlignment="Stretch"
                                                Content="{Binding}">
                                    <ContentControl.ContentTemplate>
                                        <ControlRecyclingDataTemplate Parent="{Binding #PART_ContentPresenter}" />
                                    </ContentControl.ContentTemplate>
                                </ContentControl>
                            </DockableControl>
                        </Border>
                    </DockPanel>
                </suki:GlassCard>
            </ControlTemplate>
        </Setter>

        <Style Selector="^/template/ Grid#PART_Grid">
            <Setter Property="Background" Value="{DynamicResource DockThemeBorderLowBrush}" />
            <Setter Property="Height" Value="0" />
            <Setter Property="DockPanel.Dock" Value="Top" />
        </Style>

        <Style Selector="^:active /template/ Grid#PART_Grid">
            <Setter Property="Background" Value="{DynamicResource DockApplicationAccentBrushLow}" />
        </Style>

        <Style Selector="^/template/ Border#PART_Border">
            <Setter Property="BorderBrush" Value="{DynamicResource DockThemeBorderLowBrush}" />
            <Setter Property="BorderThickness" Value="0" />
        </Style>

    </ControlTheme>

</ResourceDictionary>