Change text on rollover and change also color of a text on rollover

programming flash
1

Hi everyone and thanks for reading my question!

I have a button with a text in it called Test1.

I want to change the text of the button in Test2 on RollOver over this button which instance name is btn1.

Initially the color of text of button is black. I also want on rollover to change it to white.

How can I achieve this?

I tried :

btn1.onRollOver = function()
{
    //var myText:TextFormat = new TextFormat();
    myText.text = 'Test2';
    myText.color='#FFFFFF'; // initially the color text (of Test1 word is black so it's #000000)
  
}

btn1 instance name for button

Test1 is the initial container of my button and it has instance name myText.

Look of my button:

http://img180.imageshack.us/i/butonr.jpg/

Thanks in advance for helping me and sorry if it seems a basic question!