09-26-2012 01:51 AM - edited 09-26-2012 01:58 AM
Look for the information about Active Frames:
"""Active Frames - You can now specify a cover image for your app. A cover appears when your app is reduced to a thumbnail (for example, when users swipe up from the bottom of the screen to switch between running apps). Previously, a scaled-down version of your app's UI was used as the cover image, but now you can create your own custom cover images and use them instead. You can even use a completely dedicated UI tree as the cover image."""
That leads to stuff like this: https://developer.blackberry.com/cascades/referenc
I don't know of an example just yet, nor do I have any code snippet of my own.