Currently QmitkNodeSelectionButton does not update on changes of the node its data or properties. E.G. changing the node name would not change an update directly. Only if an rendering update is provoked, one would see the change.
QmitkNodeSelectionButton should register eventlisteners for the node to be aware of relevant changes and update itself accordingly.
It also should unregister the listneres in its destructor or if another or no node is selected.