Creating Dynamic vars

programming flash
1

Hello,
I’ve got little problems to create dynamic variables and i’m looking everywhere for the right syntax, but i cannot get this code works :

public function drawStage(tBitmaps:Array){

    
    var c0:Bitmap ;var c1:Bitmap ;var c2:Bitmap ;
    //here i'd like to place a loop to create my c's dynamically
    //but got some syntax problems i guess
    var lng:int = 3;
    
    
    for(var i:int=0;i<lng; i++){
        
        this["c"+i]= new Bitmap( tBitmaps*);
        //here it wont work, unless i wrote
        //c0 = new Bitmap( tBitmaps*);
        
    }
}

What’s the main difference between c0 (working) and this[“c”+0] (not working) ?