Why is this WPF RoutedCommand bound Context MenuItem disabled?

Question

I\'m still fumbling my way around WPF at the moment, and can not figure out why this context menu item is disabled:

Answer 1

An even simpler answer would be to add a call to Focus() in the Window's constructor. I bumped into this issue yesterday and spent quite a bit of time figuring out what was going on. I blogged about it here: http://cebla5.spaces.live.com/blog/cns!1B8262ED00250003!206.entry

The blog post will explain why calling Focus() in the constructor works.