Created Issue: [AvalonDock 2.0] - DocumentPane doesn't get focus when inside control clicked [15771]

I have a winform richtextbox, a wpf toolbar and a wpfF scrollbar in each DocumentPane. Target DocumentPane gets focus when I click inside the richtextbox. But when I click the toolbar or drag the scrollbar, target DocumentPane doesn't get focus.
Any hint on how to fix or workaround is appreciated.