im working on crearte new type of component (when it will be done ill post code somewhere there or create "pull-request")
so main problem is that i found is that i can not extend TabbedComponent::ButtonBar becouse it is private class.
i just wont know reason of that decision - why it was done like that?
suggestion would be update it and create protected - to be posible extend it - becouse for me there is need to add to it DragAndDropTarget behavior.
or maybe there is some othere solution for that?