So much is not obvious in WPF. For example, say you have a linear gradient filling a control. Want to transition to another color? Just animate to a new brush. Oh, if only you could.
Anyway, there is no time for judgment. Let’s just hope future feature enhancements enable this. Meanwhile, here’s how you do it with WPF4:
The scenario is a simple buttons list. You want them to track your mouse’s movements and highlight. Then lose their highlight slowly as you move away.
I have wrapped them in a ScrollViewer. And these aren’t really buttons, they are just Border controls. But, it just goes to how you can do the same magic to just about any control.
A shared Style resource is attached to each of the Border controls, and if you look at the code (here) you can see the syntax is tricky, but not rocket science.