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 Register with this application's toolkit for "toolkit-specific" event notifications.Parameters:
  
    |  | listener,: | an EventListener object which will receive the requested events from the application's toolkits via toolit 'bridges' |  |  | eventName,: | a UTF-8 string indicating the type of (toolkit-specific) event being requested. Not all applications can generate toolkit events of a given type. | 
 Note:For most event support, clients should use non-toolkit-specific events whenever possible, via Registry::registerGlobalEventListener - this method is provided as a 'back door' when generic names do not exist for the events in question.
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