[wxPython] Newbie Q: Redrawing wxGrid cells.

wxPython Users
1

I have code like this to update a cell in a wxGrid using a custom
table:

class MyGrid(wxGrid):
  def __init__(self):
    ---snip---
    self.table=MywxPythonTableBase()
    ---snip---

  def OnKeyDown(self, evt)
    ---snip---
    self.table.SetValue(row,col, number)
    ---snip---

How to I tell wxPython to update the display of the grid cell having
changed it's value?

Apologies if this a lame question.