How to know which parts need invalidating? - DOTNET

I solved it. I put an handler in Form.Activated to repaint everything
everytime the form gets focus.

Thanks for reading.

"Chris Y" <chris@cursespam.com> wrote in message
news:uJQ$46oIGHA.524@TK2MSFTNGP09.phx.gbl...
>I have an application where for performance reasons I am Invalidating parts
>of a Panel depending which part of the Panel has been modified.
>
> I am doing fine until I have the application covered by other Windows
> applications. When another application covers my app, getting my
> application back into focus by clicking its title bar or Alt-Tab works
> fine as somehow Windows knows how to restore the previously hidden parts.
>
> However, if I click some part of my Panel to get the application into
> focus, and where that particular click action would normally Invalidate
> only certain parts of the Panel, then only those certain parts would be
> repainted when my application gets back focus. Windows does not restore
> the parts of my application which was previously covered by another
> window.
>
> What are you recommendations for handling such a situation? Thanks.
>