mulitple custom events question

I'm using the following code to create events my question is how do i create multiple events? I need each event to contain a diffrent data parameter.

PHP Code:

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package NetConnections.Call{ 
    // Import class 
    import flash.events.Event; 
    // EventType 
    public class NumUserEvent extends Event { 
        // Properties 
          public var num0:*; 
          // Constructor 
          
           
          
          public function NumUserEvent(type:String, bubbles:Boolean = false, cancelable:Boolean = false, ... a:*) { 
               
               super(type, bubbles, cancelable); 
               num0 = a; 
              
           } 
           
        // Override clone 
        override public function clone():Event{ 
            return new NumUserEvent(type, bubbles, cancelable, num0); 
        }; 
        
    } 
} 


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PHP Code:

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import NetConnections.Call.NumUserEvent;

//  ...

dispatchEvent( new NumUserEvent('customEvent', false, false, {a:1}) );
dispatchEvent( new NumUserEvent('customEvent', false, false, {b:2}) ); 


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