assigning value to dynamic text box on stage via actionscript 3.0 class

on Adobe Animate canvas

there is a textbox name : myTextBox i.e. dynamic variable.

now in actionscript class

{

var cc:String = dropTarget.parent.name;

myTextBox.text = cc;

Access of possbily undefined property

}

package net.asit.aqua

{
	
	import flash.display.MovieClip;
	import flash.events.MouseEvent;
	import flash.geom.Point;
	import flash.text.Font;
	import flash.text.StageText;
	import flash.text.TextField;
	import flash.display.Sprite; 
    import flash.text.*; 	
	import flash.display.DisplayObjectContainer;

	
	public class AquaScript extends MovieClip {

.
.
.
.

{

var cc:String = dropTarget.parent.name;

myTextBox.text = cc;

.....

}

Somehow I have to assign values in text box via actonscript class only.