Sub Classing Window and UserControl

I wanted to add a standard method (InjectModel) into our Windows and UserControls and the obvious technique was to subclass them with something like this:

public partial class PersonEditView : WindowBase
{
...
}

public class WindowBase : Window
{
...
}

The xaml then needs to reference the WindowBase class like this:

<local:WindowBase x:Class="INPC2.PersonEditView"
    ...
    xmlns:local="clr-namespace:INPC2"
    >
   <local:WindowBase.Resources>
   ...
   </local:WindowBase.Resources>
...
</local:WindowBase>

There is no problem with the forward reference to xmlns:local