x:Static markup extension

Question

I have a Window.Resource object and the next statement

  <CollectionViewSource 
          Source="{Binding Source={x:Static Application.Current}, Path=someProperty}"   
          x:Key="someView" />

But what if I need to point to a public property in the Window's code-behind, not the App's? I've tried to use 'this' instead of 'Application.Current', but it doesn't work.

Help me...

UPD: Actually found a way:

  Binding Source=Self