WPF HeaderContent Control Vertical Alignment - wpf

Question

How can I get HCC using a tab control to "Stretch" all the way down vertically? How can I achieve this?
Here is the header content control XAML:
<HeaderedContentControl
Content="{Binding Path=Workspaces}"
ContentTemplate="{StaticResource WorkspacesTemplate}" />
Here is the corresponding style info:
<DataTemplate x:Key="WorkspacesTemplate">
<TabControl
IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource ClosableTabItemTemplate}"
Margin="4"
/>
</DataTemplate>
<DataTemplate x:Key="ClosableTabItemTemplate">
<DockPanel>
<Button
Command="{Binding Path=CloseCommand}"
Content="X"
Cursor="Hand"
DockPanel.Dock="Right"
Focusable="False"
FontFamily="Arial"
FontSize="9"
FontWeight="Bold"
Margin="0,1,0,0"
Padding="0"
VerticalContentAlignment="Bottom"
Width="16" Height="16"
/>
<ContentPresenter
Content="{Binding Path=DisplayName}"
/>
</DockPanel>

Answer 1

If you examine the control template for the HeaderedContentControl you'll find it puts the content in a StackPanel which is why content isn't stretching vertically. This is the default template:
<Style x:Key="HeaderedContentControlStyle"
TargetType="{x:Type HeaderedContentControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type HeaderedContentControl}">
<StackPanel>
<ContentPresenter ContentSource="Header"/>
<ContentPresenter/>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
So if we replace the StackPanel with a Grid like this:
<Style x:Key="HeaderedContentControlStyle"
TargetType="{x:Type HeaderedContentControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type HeaderedContentControl}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ContentPresenter ContentSource="Header"/>
<ContentPresenter Grid.Row="1"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
and use that style
<HeaderedContentControl
Style="{StaticResource HeaderedContentControlStyle}"
Content="{Binding Path=Workspaces}"
ContentTemplate="{StaticResource WorkspacesTemplate}" />
then the content should stretch vertically.