View is not updated after adding/removing subnodes

[mlototchi]

The collectionChanged event only of the root-nodes-collection causes an update of the view, but not the collections of the subnodes. Looking at the code, i guess it is because the invoking of a render-Method like in your TreeView Class is missing in the TreeViewNodeView Class

[enisn]

Yes, subnodes collection isn't ObservableCollection at the moment. I'll work on it