update
public boolean update(IdeAction action,
             Context context)
This method updates the enabled status of the specified action within the
 specified context. It should generally be called on the controller
 associated with the active view to allow that controller to take the
 first crack at determining its enabled status. If that controller
 wants to update its enabled status, it does so and returns true to
 indicate that further controllers do not need to be consulted. If the
 controller does not deal with setting the enabled status of an action,
 it delegates the request to its supervising controller, all the way up
 to the Ide. The Ide has a special implementation of update(xx) that
 further delegates the request to root controllers, until one of them
 returns true indicating the request was handled by the controller.
- Specified by:
 
update in interface Controller 
- Parameters:
 action - action whose command is to be executed.context - the current context 
- Returns:
 - true if the controller handles the specified command.