Setting up a DocumentItemTemplateSelector

Hi Tony,

By default, the item will only be assigned to the Content property of the docking windows. This differs from other headered items controls, which would also assign the item to the Header property if the item is not a visual. This is done because by default the Header is bound to the Title property.

You can pass the item to the Header property using an implicit Style like so: Also, like other ItemsControls that use HeaderContentControls as their containers, the DocumentItemTemplate/Selector and ToolItemTemplate/Selector are only applied to the Header (via the HeaderTemplate/Selector properties). To apply a custom DataTemplate/Selector to the Content, you'd need to explicitly set the ContentTemplate/Selector on the DockingWindow.

Also, like other items controls that use a HeaderContentControl as their containers, the DocumentItemTemplate, DocumentItemTemplateSelector, ToolItemTemplate, and ToolItemTemplateSelector properties are only applied to the Header (via the HeaderTemplate and HeaderTemplateSelector properties). To apply a custom DataTemplate/DataTemplateSelector to the Content property, you'd need to explicitly set the ContentTemplate or ContentTemplateSelector on the docking window. This can be done using a style or in an override for the PrepareContainerForItemOverride method.

So I suspect you are not setting the Title, so Header would always be null (the default value for Title). You can either set the Title to a valid value, or use the Style above to pass the item to the Header property.

I've updated the documentation to include this information also.

I've been having a lot of trouble getting this to work.  When I set the ContentTemplateSelector property in my DockingWindow style, then the Item in the ContentTemplateSelector and the DataContext for the DataTemplate becomes the ContentControl containing the ViewModel, rather than the ViewModel itself.

<Style
  TargetType="{x:Type apdock:DockingWindow}"
  >
  <Setter
    Property="ContentTemplateSelector"
    Value="{StaticResource EditorTemplateSelector}"
    />
</Style>

This results in the following SelectTemplate method where the actual ViewModel is in the Content property of item (which is a ContentControl):

public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
    var contentControl = item as ContentControl;
    if (contentControl != null && contentControl.Content != null)
    {
        return Application.Current.TryFindResource("editor_" + contentControl.Content.GetType().Name) as DataTemplate;                
    }
}

 Any ideas how I can go about fixing that without hacking DataContexts?