CS4 button not staying in down state

[teachmeflash]

Ok, I think I am being extremely blond, but have looked everywhere and just not finding the solution. I've put the following code:

stop();

mybutton1.addEventListener(MouseEvent.CLICK, myButtonClick);
mybutton1.addEventListener(MouseEvent.ROLL_OVER, myButtonRollover);
mybutton1.addEventListener(MouseEvent.ROLL_OUT, myButtonRollout);


function myButtonClick(ev:MouseEvent):void
{
gotoAndStop(2);
}

function myButtonRollover(ev:MouseEvent):void
{
gotoAndPlay(2)
}

function myButtonRollout(ev:MouseEvent):void
{
gotoAndPlay(1)
}

Now what happens is the rollover works perfectly, and rollout works perfectly, but once I click it it doesn't stay orange anymore :-(