wxTextCtrl problem

[austin]

I produced 5 wxTextCtrl.
My program is to let the user enter the serial number.
Each wxTextCtrl has 4 maxlength.
My ideal is
if the user enter 4 digits on first wxTextCtrl, and the program will move
the cursor to the second wxTextCtrl.
I checked the wxTextCtrl::SetInsertingPoint.
But this function is only move on itself.
For exammple,

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

....
....

self.tctrl_1 = wxTextCtrl(......)
self.tctrl_2 = wxTextCtrl(......)

self.Bind(EVT_TEXT,self.OnTextProcessing_1,self.tctrl_1)
self.Bind(EVT_TEXT,self.OnTextProcessing_2,self.tctrl_2)

....
....

def OnTextProcessing_1(self,evt):
 if len(evt.GetString())==4:
  self.tctrl_2.SetInsertionPoint(0)

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


The code "self.tctrl_2.SetInsertingPoint(0)" doesn't work.
But if i change to "self.tctrl_1..." works fine.

So what's problem?