A really basic drawing question

Thank you for reading this.

It's been awhile since I've done anything useful with wxPython and I 
find that I now cannot get past a very basic concept.

I want to call Fill_board() but even though the function is called it's 
not drawing anything, just a blank window is displayed. It must have 
something to do with a drawing context.

class Mywin(wx.Frame):
     def __init__(self, parent, title):
         super(Mywin, self).__init__(parent, title=title, size=(500, 400))

         self.Bind(wx.EVT_PAINT, self.OnPaint)

         self.InitUI()

     def InitUI(self):

         self.Bind(wx.EVT_PAINT, self.OnPaint)
         self.Centre()
         self.Show(True)

         self.Fill_board(self) ---> Fill_board() is called but it's not 
drawing anything.

      def Fill_board(self, dc):
         dc = wx.ClientDC(self)

         dc.SetPen(wx.BLACK_PEN)

         for y in range(board_y):
             for x in range(board_x):
                 dc.SetBrush(random.choice(colours))
                 dc.DrawRectangle(x * 20 + 100, y * 20, 20, 20)

However, if I call Fill_board() from an event such as a paint event (as 
shown below) or a timer event, then a filled board is displayed.

      def OnPaint(self, e):
         dc = wx.PaintDC(self)
         self.Fill_board(dc)  ---> if called from an event such as 
OnPaint() then all is good.

I've searched through wxdemo examples but haven't found anything as 
simple as what I'm asking about. What am I missing?

-- 

Regards,
Phil

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