When you download and install the BlackBerry Playbook SDK, it automatically installs the BlackBerry class files into Flash Builder. If you are using Flash Professional CS5 to create BlackBerry Apps you have to install the classed manually. The classes are located in the BlackBerry Playbook SDK folder. They are in Framework/libs/qnx-screen/qnx-screen.swc. You have to tell Flash where the classes are located by using the ActionScript Settings in Flash Professional. View the video for more information.