Screen

Use the Screen class to define a manager to lay out UI components on the screen and to define a specific type of screen using the styles that the constants on the Field superclass define.

FullScreen

Use a FullScreen class to provide an empty screen that you can add UI components to in a standard vertical layout. If you want to use another layout style, such as horizontal or diagonal, use a Screen class instead and add a Manager to it.

MainScreen

Use a MainScreen class to create a screen with the following standard UI components:

• default position of a screen title, with a SeparatorField after the title
• main scrollable section contained in a VerticalFieldManager
• default menu with a Close menu item
• default close action when the BlackBerry® device user clicks the Close menu item or presses the Escape key

You should consider using a MainScreen object for the first screen of your BlackBerry device application to maintain consistency with other BlackBerry device applications.