Please excuse me for the misunderstanding - now I realize what you had asked. The control you desire is not RadMenu but RadPanelBar.
Here is a link to an example: http://www.telerik.com/demos/aspnet/panelbar/examples/appearance/skins/defaultcs.aspx
If you click on File-> New, you could observe the same functionality as the one on the link from the previous post.
Again, at the lower part of the RadPanelBar page you could find the code.
As to your second question - unfortunately, there is no irc channel for the Telerik community yet.
Hope this helps.
the Telerik team