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Tree node begin edit event

import wx class TestFrame(wx.Frame):     def __init__(self):         wx.Frame.__init__(self, None, title="tree: misc tests", size=(400,500))         il = wx.ImageList(16,16)         self.fldridx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FOLDER, wx.ART_OTHER, (16,16)))         self.fldropenidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FILE_OPEN,   wx.ART_OTHER, (16,16)))         self.fileidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_NORMAL_FILE, wx.ART_OTHER, (16,16)))                  self.tree = wx.TreeCtrl(self, style=wx.TR_DEFAULT_STYLE | wx.TR_EDIT_LABELS)         self.tree.AssignImageList(il)         root = self.tree.AddRoot("wx.Object")         self.tree.SetItemPyData(root, None)         self.tree.SetItemImage(root, self.fldridx,wx.TreeItemIcon_Normal)         self.tree.SetItemImage(root, self.fldropenidx,wx.TreeItemIcon_Expanded)                  tree = ["A","B","C","D","E","F","G","H"]         self.AddTreeNodes(root, tree)         self.tree.Expand(root)         self.Bind(wx.EVT_TREE_ITEM_ACTIVATED, self.OnActivated, self.tree)         self.Bind(wx.EVT_TREE_BEGIN_LABEL_EDIT, self.OnBeginEdit, self.tree)                  def GetItemText(self, item):         if item:             return self.tree.GetItemText(item)         else:             return ""              def OnActivated(self, evt):         print "OnActivated:    ", self.GetItemText(evt.GetItem())     def OnBeginEdit(self, evt):         print "OnBeginEdit:    ", self.GetItemText(evt.GetItem())         item = evt.GetItem()         if item == self.tree.GetRootItem():             evt.Veto()             print "*** Edit was vetoed!"     def AddTreeNodes(self, parentItem, items):         for item in items:             if type(item) == str:                 newItem = self.tree.AppendItem(parentItem, item)                 self.tree.SetItemPyData(newItem, None)                 self.tree.SetItemImage(newItem, self.fileidx,wx.TreeItemIcon_Normal)             else:                 newItem = self.tree.AppendItem(parentItem, item[0])                 self.tree.SetItemPyData(newItem, None)                 self.tree.SetItemImage(newItem, self.fldridx,wx.TreeItemIcon_Normal)                 self.tree.SetItemImage(newItem, self.fldropenidx,wx.TreeItemIcon_Expanded)                     self.AddTreeNodes(newItem, item[1]) app = wx.PySimpleApp(redirect=True) frame = TestFrame() frame.Show() app.MainLoop()