Event listener between classes

1

Hi

I have a slider what changing zoom in my main class and I have around 30 instances of another class on screen in different movie clips containers.

I want all 30 instances react when in main movie slider change position.

From other words. I want to set event listeners in each child class and dispatch event when its appeared in main movie.

class main{
private function zoomSldChanged(evt:SliderEvent){
			someObject.dispatchEvent(new Event(Event.CHANGE,true,false));
}
}
 
class sids{
function sids()
someObject.addEventListener(Event.CHANGE,sliderCHANGE);
			}
		
		private function sliderCHANGE(evt:Event){
			trace("Hi");
			
		}
}

I feel like I need someObject Object to listen events but
what is someObject should be?
Is it possible to do so?
any help appreciate.