**updated this post for Blend 3 RC release
Have you ever used WinSplit Revolution? It’s a utility that helps you organize your windows into regions to assist with organizing your screen real estate. I find this to be a very useful tool, especially when I use two monitors while doing development, being able to organize my windows neatly makes a huge difference. One cool feature is called Drag’n'Go. When you drag your window outside your screen boundary, a semi-transparent rectangle (I’d like to call it an overlay) appears to cue you on the location of where the window will be docked. I really like this feature, and wondered how difficult it would be to incorporate this into a Behavior for a Window class in WPF to exhibit the same kind of functionality. Here’s my result.