Instead of "poking" UI components, users interact with content on the screen using gestures. Avoid cluttering the screen with UI components and design your application to use the available gestures. For example, let users zoom into a picture with the spread gesture instead of tapping a button to incrementally zoom in.
BlackBerry 10 smartphones support gestures from the device bezel (the frame around the display area of the screen). You don't need to implement these gestures in your app. They are provided automatically.
If they apply to your app, you can use the following gestures to let users directly manipulate content.
If users select a few items at once and try to perform an action that can't be done on all of them (for example, because some are locked), do it on the items you can. Then display a toast to say why it wasn't done on some items.