8.5. Commands
Abstract Commands are the operations that the applications add to the user interface. Commands can be added to all Displayables, so they are part of the application when using both high-level or low-level API. The most common task for Commands is to provide users with a way to navigate between different Displayables of an application. Normally, if there are no Commands in a Displayable, the user has no way to proceed to other Displayables.
Commands are added to a Displayable using addCommand method. There is also removeCommand to remove already-added commands. This allows to dynamically change available operations within displayables.
When the user selects a Command from the user interface, the device calls the CommandListener
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