When you export a theme, you choose the specific device to export the theme for.
The BlackBerry Theme Builder scales the screen elements to fit the specified screen dimensions. You must create your theme project for the specific screen dimensions of a BlackBerry device. Other changes that you make in the theme project apply. You can change from one layout type to another at any time, however, if you customize the Home screen, the customizations do not apply in the new theme layout. You can create your new theme project using the selected layout type as your starting point. Additional resources Check out some additional resources, including a Flash tutorial, Supported Features reference, and Release Notes.
Test & distribute your themes Find out how to use the simulator or BlackBerry device to test your theme, and how to get your theme onto users` devices.Create theme assets Learn how to develop backgrounds, border images, sprites, and other assets that you can use in your theme.Customizing UI controls and application lists.Customizing the Application List screen.Designing themes Customize banners, screens, and UI components to put your personal stamp on the BlackBerry UI.