I modified the sample in order to add a panes on a button click. You can find the project attached as well. In order to dynamically add a panes to the document host, all you need is to call the IRegionManager.AddToRegion method and specify a region and a view. Please, note that there is a bug in the document host and the GroupPane placed inside is not recognized as a region. You could workaround this problem defining the region manually in the Shell c'tor: documentHost.SetValue(RegionManager.RegionManagerProperty, regionManager);
Hope this helps.
the Telerik team
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