I am trying to make the content of a ContentPane fill the entire available area when the pin/close buttons and header are collapsed. When I do this, I am left with some white space at the top of the content that I am not sure how to get rid of.

I set up the content pane as so:

var contentPane = new ContentPane
{
   Content = contentControl,
   AllowPinning = module.AllowPinning,
   AllowClose = !module.Required,
   AllowDockingFloating = module.AllowFloating,
   AllowDocking = true,
   Image = null, 
   PinButtonVisibility = module.AllowPinning ? Visibility.Visible : Visibility.Collapsed,
   WindowPositionMenuVisibility = Visibility.Collapsed,
   CloseButtonVisibility = module.Required ? Visibility.Collapsed : Visibility.Visible,
   HeaderTemplate = Application.Current.FindResource("DockingViewHeaderTemplate") as DataTemplate
};

Then to hide the header text, I use the DockingViewHeaderTemplate:

<this:StringEmptyConverter x:Uid="Converters:StringEmptyConverter" x:Key="StringEmptyConverter"/>

<DataTemplate x:Uid="DockingViewHeaderTemplate" x:Key="DockingViewHeaderTemplate" >
     <TextBlock Text="{Binding}" Visibility="{Binding Converter={StaticResource StringEmptyConverter}}"/>

</DataTemplate>