Team posts on Styles and Templates
Check out a couple of personal blog postings from some members of the Expression team.
Adrian Vinca [1] explains how to create a simple Style which has a Trigger [2].
Mario Guzzi [3] explains how using Expression Interactive Designer makes things like creating a ListBox which scrolls horizontally [4] really easy.
[1] https://blogs.msdn.com/adrianvinca/
[2] https://blogs.msdn.com/adrianvinca/archive/2006/02/16/532949.aspx
[3] https://blogs.msdn.com/mariogu/
[4] https://blogs.msdn.com/mariogu/archive/2006/02/13/531353.aspx