Double-clicking is not supported. You can submit a feature request for this: http://devcenter.infragistics.com/Protected/RequestFeature.aspx. However, you can turn mdi child into floating panes. To do so, you must first define the contents of the tab on a Panel or UserControl. Then dock that control in your dock manager. Set the DockableControlPane's IsMdiChild property to True. At run-time, it will appear as an mdi child tab. Then you can right-click the tab and check the 'Dockable' menu item to turn it back into a floating pane.