Read original post by András Velvárt at Dotneteers Blog
I am a huuuuuuge fan of Behaviors (and Actions and Triggers) for Silverlight and WPF. I have been very disappointed when WinRT turned out not to support them.
Luckily, Joost Von Schalk created WinRTBehaviors on CodePlex (also available on NuGet). But his solution still lacks any Blend support. I have not been able to reproduce the full Blend behavior editing experience, but I managed to take the first baby-step that at least saves you from creating Behaviors from code. Here is how to use the updated WinRTBehaviors with Blend.