C1TreeView Edit
---------------------------
Shows how to make nodes editable in a C1TreeView control.

The sample uses the EditTemplate property which allows the user
to edit the node contents using F2 key (Esc key cancel the edition,
and Enter key commits the edition).

For the C1TreeView to reflect the changes, the underlying data items
must implement INotifyPropertyChanged interface.

Also, if the underlying data item implements IEditableObject, the C1TreeView
will invoke the interface methods when required.