How do I repaint a form after it was restored from a minimized state?

I have a form in which i paint a waveform on a button click that is as soon as i click button, the waveform displays. Now when i minimize the form and maximize it again, the waveform disappears.How to repaint it? I have seen people using paint event b开发者_JAVA百科ut i dont know how to use it after/inside the button click event. Please help.

If you call Control.Invalidate(), the Paint event will occur.