It\'s easy for a WPF application to make parts of a window transparent or semi-transparent. But how to I apply the current Vista theme (colors, opacity) to these transparent
Take a look at this link, look for the section titled "IE7 – Extending the glass frame":
http://blogs.msdn.com/wpfsdk/archive/2008/09/08/custom-window-chrome-in-wpf.aspx