I like when I'm in an app and I can just double tap the home button and get a pop up letting me either play/pause, rewind, fast forward, close the pop up, or open the iPod. But what causes that pop up box to open sometimes, and the iPod itself to open others?
I ALWAYS want the pop up box to come up so I can stay in my current app, but sometimes double tapping the home button closes the app and opens the iPod. It's really annoying when it does that.

Is there any way to stop the iPod from opening and make it where only the pop up box shows up?