def addEvent(self, event):
sPath = self.tree.getSelectionModel().getSelectionPath()
if sPath: # Use selected node
parent = sPath.getLastPathComponent()
else: # Nothing selected, use root
parent = self.model.getRoot()
kids = parent.getChildCount()
child = DefaultMutableTreeNode('New node %d' % self.getSuffix())
self.model.insertNodeInto(child, parent, kids)
self.tree.scrollPathToVisible(TreePath(child.getPath()))
