Form KeyPress event

Hello guys. I have a simple form and I have activated KeyPress event. Everything it's ok. But when I put a button on the Form, and I run it, if I press any key the KeyPress event will not work anymore... On my form I see that my button is selected ( if I press space it's like I click on the button ). How can I deselect the button...? Cuz if I press on the form and then I type something, it still doesn't works...