ActionScript 3.0 :: 2D Array - How To Display Result Of Dice Roll On TextBox

I have a 2D array that creates a table with value that contain sum of 2 dices. But I want the result of the dice roll display on the appropriate text box on the table. I'm stuck at getting position of textbox which shown at bottom code where I have it as that position as now. Select is the instance name of those textbox.

Code:
var row:int=7;
var colum:int=7;
var dicechar:Array=new Array();
var reddice:int
var whitedice:int
var textboxarray:Array=new Array();
[Code] .....