It won't.  It will handle the Paint event, not override OnPaint().

But Tom's question isn't really about overriding OnPaint().  Overriding  
that method is easy.  You just add a new OnPaint() method in your subclass  
with the keyword "override".  That's not what he's asking about though (in  
spite of this inaccurate subject line).

He really wants to override the non-client rendering of the window.  As  
far as I know, there's no way to do this directly from .NET.  I think it's  
possible that if he overrides the WndProc() method and handles the  
NC_PAINT messages himself it _might_ work.  But I don't really know enough  
about how .NET and the underlying unmanaged window class interact to know  
for sure.

Pete