I need to remove all the extras from a class

programming flash
1

I am making a game and I want to remove all that I dont need from a class:

I just need:
addEventListener
removeEventListener
dispatchEvent
graphics
x
y

package  
{
	import flash.display.Graphics;
	import flash.display.Stage;
	import flash.events.EventDispatcher;
	
	public class MinUnit extends EventDispatcher
	{
		public var graphics:Graphics;
		
		public var stage:Stage;
		
		public var x:Number;
		public var y:Number;
		
		public function MinUnit()
		{
			graphics.beginFill(0xFF0000);
			graphics.drawRect(-1, -1, 2, 2);
			graphics.endFill();
			
			stage = root;
			
			x = Math.random() * stage.stageWidth;
			y = Math.random() * stage.stageHeight;
		}
		
	}
	
}

but I dont know how to make it work?

what am I doing wrong or what is missing?

thanks