Hi,
The last Q1 2011 release, the expander control had an issue. But while fixing that issue, using your (http://www.telerik.com/community/forums/silverlight/expander/expander-problem-in-radcontrols-for-silverlight-q1-2011.aspx)Telerik.Window.Control dll my other Telerik.Window.Control.Charting dll didn't support in my project.
Can you let us know, when do you have plan for the next internal release?