Please find the answer to your question in the other forum thread that concerns the CollapsiblePane implementation: http://www.telerik.com/community/forums/winforms/panels-and-labels/collapsible-panels.aspx
We would kindly ask you to use just one support channel to contact us. Posting the same questions more than once may slow our response time down, because we will need to review and address two or more tickets instead of one. Moreover, support threads are handled according to license and time of posting, so if it is an urgent issue, we suggest that you use a support ticket, which would be handled before a forum thread.
the Telerik team