Vista - Having a window extend an abstract class

Is this possible? I've developed an abstract .cs class which extends
from Window. I'd now like to extend other window classes from my window
(specified both in the .xaml and .xaml.cs files) and I get the following
error:

Error 10 Can't specify an element of type
Lab49.ApplicationWindowManager.ManagedWindow. Only non-abstract types
are allowed as elements. Line 2 Position 19. C:\Documents and
Settings\jdolinger\My Documents\Visual Studio\Projects\WPF
Demos\TradingDemo\TradingDemo\TestClass.xaml 2 19 TradingDemo

A quick example would look something like this:


// The abstract class (no .xaml for this)
public abstract class MyAbstractWindow : Window {

}


// The .xaml file:
<?Mapping XmlNamespace="http://local" ClrNamespace="MyNamespace" ?>
<local:MyAbstractWindow x:Class=MyNamespace.ConcreteWindow>
...
</local:MyAbstractWindow>



// The concrete window class .xaml.cs file:
public partial class ConcreteWindow : MyAbstractWindow {

}



When I remove the abstract keyword from the superclass, everything works
fine. But this really should be an abstract class, I don't want people
to be able to instantiate. Is this specifically prohibited for a reason?

Thanks!
Jason

Unfortunately this is an unsupported scenario in V1 Avalon. Please
check in future versions of the platform.
Thanks!