Attached to this thread you'll find a screenshot which demonstartes the problem: We habe for example 20 RadPanes on a RadPaneGroup and the RadPaneGroup's width is to small to display them all in one horizontal layer. We like display that many RadPanes which fit in the RadPaneGroup (depending on it's width), let's say 5 will fit in with theier orgin with. The other 15 which do not fit in should be displayed in the ContextMenu with the possibility to be selected. Any Idea how to achive that? BTW: We already tried the OverflowMode property, but this seems not to work.