Custom Event with multiple EventTypes

Question

Hello All, First thanks for all those who tryied to help me and apologize for my approximative english.
I would like to create the more properly as possible a Custom Event with multiple EventTypes, like the MouseEvent typicaly. 
With Some EventType which permit to acces to some attributes and other not. But I'm totaly lost,  The second solution if someone knows how, is to explain to me how to do to acces to the code of the MouseEvent.as 
Thanks! 
Ps: you will find below the basis of the code i have begin. 
package fr.flashProject
    import flash.events.Event;
     * @author
    public class SWFAddressManagerEvent extends Event
        public static const CHANGE_PAGE:String = "change_page";
        public static const ERROR_404:String = "error_404";
        public static const HOME_PAGE:String = "home_page";
        private var _page:String;
        private var _params:Object;
        public function SWFAddressManagerEvent(type:String, pPage:String = null, pParams:Object = null, bubbles:Boolean=false, cancelable:Boolean=false)
            super(type, bubbles, cancelable);
            _page = pPage;
            _params = _params;
        public override function clone():Event
            return new SWFAddressManagerEvent(_type, _page, _params, bubbles, cancelable);
        public override function toString():String
            return formatToString("SWFAddressManagerEvent", "type", "page", "params", "bubbles", "cancelable", "eventPhase");
        public function get page():String { return _page; }
        public function get params():Object { return _params; }       

Answer 1

I am not sure what you are trying to accomplish but event can have only single type. Event type is just a string that is typically a constant - exactly like your constants.
When dispatched, each event INSTANCE has only one type. Again, these types are described in a type parameter by a string. Each dispatched MouseEvent DOES NOT have multiple types but ONLY ONE. It does have multiple constants that are used to assign type at runtime as does your event.
If you are talking about multiple parameters, you already do that in your custom event class. You have _page and _params. Nothing stops you from adding more parameters.
Also I am not sure why you need getters for _page and _params.