Controller Methods
The Controller type exposes the following members.
Methods
If an ICommand has previously been registered  to handle a the given INotification, then it is executed. 
Controller Multiton Factory method. 
Check if a Command is registered for a given Notification  
Initialize the Multiton Controller instance 
Register a particular ICommand class as the handler  for a particular INotification. 
Remove a previously registered ICommand to INotification mapping. 
Remove an IController instance