Test code for Tree Selection Problem.

test-tree.py

import wx

class MyFrame(wx.Frame):
    def __init__(self, *args, **kwds):
        kwds["style"] = kwds.get("style", 0) | wx.DEFAULT_FRAME_STYLE
        wx.Frame.__init__(self, *args, **kwds)
        self.SetSize((400, 300))
        self.tree = wx.TreeCtrl(self, wx.ID_ANY, style=wx.TR_MULTIPLE)
        self.root = self.tree.AddRoot("My Tree")
        sizer_1 = wx.BoxSizer(wx.VERTICAL)
        sizer_1.Add(self.tree, 1, wx.EXPAND, 0)
        self.SetSizer(sizer_1)
        self.Layout()
        self.Bind(wx.EVT_TREE_SEL_CHANGED, self.on_tree_selection, self.tree)
        for j in range(20):
            for k in range(5):
                self.tree.AppendItem(self.root, str(k))
        self.tree.ExpandAll()

    def on_tree_selection(self, event):
        label = self.tree.GetItemText(self.tree.GetFocusedItem())
        h = self.tree.GetFirstChild(self.root)[0]
        while h.IsOk():
            if label == self.tree.GetItemText(h):
                self.tree.SelectItem(h, True)
            h = self.tree.GetNextSibling(h)

class MyApp(wx.App):
    def OnInit(self):
        self.frame = MyFrame(None, wx.ID_ANY, "")
        self.SetTopWindow(self.frame)
        self.frame.Show()
        return True

if __name__ == "__main__":
    app = MyApp(0)
    app.MainLoop()