public static interface CellRendererText.Edited

Event generated after user activated a cell, changed its content and pressed Return.

Note that the act of editing the cell in the TreeView does not cause a change in the underlying model. In the usual case (where a given TreeModel is only being used as the backing store for the TreeView) then you'll want to update it:

 renderer.connect(new CellRendererText.Edited() {
     public void onEdited(CellRendererText source, TreePath path, String text) {
         model.setValue(model.getIter(path), column, text); 
     }
 }
 

assuming you have access to the TreeModel and DataColumn variables.