Way to rig folio flap when using iPad so it stays put?

Is there a way to add some type of magnet to your folio flap so when you are using your iPad, it stays locked in place? I hate not having it lock in place when you have it wrapped around the back of an iPad.

Is there a simple solution out there? Maybe a Magnet with that you can stick to the folio flap?

 

Well I am referring to the Targus Slim case. I want to do something so that the flap stays put when its folded flat to the back of the iPad....