PyCWnd.InvalidateRect
InvalidateRect(rect, bErase)
Invalidates an area of a window.
Parameters
rect=(0,0,0,0) : (left, top, right, bottom)
Rectangle to be
updated. If default param is used, the entire window is invalidated.
bErase=1 : int
Specifies whether the background within the update region is to be erased.
MFC References
CWnd::InvalidateRect