Button Click event-make text appear

Im thinking this is easy but i cant figure it out. See attached file. When the side button is clicked and the user chooses the red or blue button, I want the color name that was chosen to show up and replace the word gray under the side button. Can someone help guide me or give me an example. Do i need to use an IF statement? The gray Dynamic text box under the side button has an instance name of myCurrentSideColor. Thanks soo much for your help.

Below is my code.

import fl.events.*;
var currentObject:MovieClip;
var currentFill:MovieClip;

blue_btn.addEventListener (MouseEvent.CLICK, colorBox);
function colorBox(e:MouseEvent)
{
var ct:ColorTransform=new ColorTransform();
ct.color=0x0033cc;
currentObject.transform.colorTransform=ct;
currentFill.transform.colorTransform=ct;
}

red_btn.addEventListener (MouseEvent.CLICK, colorBox2);
function colorBox2(e:MouseEvent)
{
var ct:ColorTransform=new ColorTransform();
ct.color=0xff0000;
currentObject.transform.colorTransform=ct;
currentFill.transform.colorTransform=ct;
}

sideSelector_mc.visible=false;
side_btn.addEventListener(MouseEvent.CLICK, selector);
function selector(e:MouseEvent)
{
sideSelector_mc.visible=true;
currentObject=box_mc;
currentFill=sideFill_mc;
}

roof_btn.addEventListener(MouseEvent.CLICK, selector2);
function selector2(e:MouseEvent)
{
sideSelector_mc.visible=false;
currentObject=box2_mc;
currentFill=roofFill_mc;
}