Thank you for writing.
For example you can set the panel and the button (which is inside it) opacity like this:
radPanel1.RootElement.Opacity = 0.5;
radButton1.ButtonElement.Opacity = 0.5;
Nevertheless I am not sure what exactly you want to achieve in this case. Perhaps you can attach a sample image of the desired layout?
I am looking forward to your reply.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.