I have a navigation panel in the left hand side of my WPF application. I want to make a button (like in photoshop or a similar program) when you push it, it expands across the bounds and “on top” of the other controls (the center column) – and allowing the user to push a button. Just like in the ribbon bar.
Does it make sense?
You should try Avalon Dock : http://avalondock.codeplex.com/ It gives you exactly what you want.