RadDocking in the RadWindow in modal dialog mode. Yes, it can be :)
Anyway, when I trying to drag a RadPane, everything is Ok until I released this pane.
1) When I clicking something in RadWindow, floating pane hides behind the overlay of RadWindow.
2) When I drop RadPane in SplitContainer (beside of primary RadPaneGroup of DocumentHost) and drag it again, it drags behind the overlay again. But if I put the pane in primary RadPaneGroup and drag it, RadPane is on top z-index again.
Sorry for my English.
Microsoft Silverlight (64-bit) Version: 5.1.41105.0
Windows 8.1 (64-bit)
Internet Explorer 11.0.9600.17416