Showing Header of Tab using Prism

Question

I'm using Prism and have a region that is a TabControl. I have a DataTemplate on the TabControl.ItemTemplate set to an interface of type IView. IView has a Title and Description string. When I call RegisterViewWithRegion with my IView, the tab is added but no description is shown on the header. Can I not bind to properties on an interface or am I missing something else?

manager.AddToRegion("ContentZone", new PrimaryView()); //Implements IView

<TabControl x:Name="ContentZone" cal:RegionManager.RegionName="ContentZone" Grid.Row="1" umn="0">
<TabControl.ItemTemplate>
    <DataTemplate DataType="{x:Type oasis:IView}">
        <DockPanel ToolTip="{Binding Path=Description}">
            <Label Padding="0"
                   Content="{Binding Path=Title}"
                   VerticalAlignment="Center" />

Edit: I found a solution, although I don't find it all that great. For some reason the DataContext of the DataTemplate was always coming back as null no matter what I did, I tried the DataTempalteSelector, but the item itself was also null. I tried changing to a base abstract class instead, and nor did that work. So this is what I ended up with for the binding itself:

{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ContentControl}}, Path=DataContext.Title}

Answer 1

You cannot associate a DataTemplate with an interface. It must be directly associated with the type. If you want to associate via an interface, you could consider implementing a DataTemplateSelector that checks whether the item implements IView and returns a DataTemplate accordingly.

HTH, Kent