FIX. RadGroupBox - memory leak when the group box Dock = Fill and Office2010Black theme is applied Work around: this.radGroupBox1.Behavior.BitmapRepository.DisableBitmapCache = true; RadDock: Add a dock with two tool windows in a UserControl. In the toolwindows add grid and a tree. Apply Office2010Black theme to RadDock. Place the control on a form, dock it and run the app. Constantly resize the form and observe the memory used. Work around: radDock1.Behavior.BitmapRepository.DisableBitmapCache = true;