title: wxPython writing to disabled wx.TextCtrl
body: <p>for a pet project of mine I am using a wxPython 2.8 and I have a dialog with a disabled wx.TextCtrl:</p>
  
  <pre><code>self.txt = wx.TextCtrl(self, wx.ID_ANY, size=(450,100),
                            style = wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL)
  </code></pre>
  
  <p>in the same dialog there is a button; when button is clicked I want to append some text (programmatically) to the TextCtrl. I tried by using </p>
  
  <pre><code>self.txt.AppendText('Hello')
  </code></pre>
  
  <p>but it doesn't work (Windows XP OS).</p>
  
  <p>Is there any way to do that ?</p>
  
  <p>thanks</p>