persistence help!

Hey guys out there. I have recently noticed that when i draw text to a picture box in visual basic 2005 express, and then move something else over the text in the picture box, the text somehow gets "erased". I looked this up and im pretty sure it's called persistence. Is there any way I can avoid the text getting "erased"? If there is certain code required to do this, it would be helpful if i can get it. Thanks!