Simplify menuitem command handling

[ribizli]

I'm quite sure this logic is unneeded complex:

            if(!item.eventEmitter) {
                item.eventEmitter = new EventEmitter();
                item.eventEmitter.subscribe(item.command);
            }
            item.eventEmitter.emit(event);

Couldn;t you simply do this:

  item.command(event);

Have I missed something, has your logic any purpose?