ActionScript 3.0 :: Conditional Click States - Toggle Button?

I have a button hit state called btnWorkH, below is the start of my code to make it functional. The idea being, that when someone clicks the button, I add a child to the top, to make it look like it has been clicked and is maintaining an alternate color. How would I code this so that it becomes a toggle? As, I need a click (once this action has been performed) that removes the child... just not sure how to write the condition for this.

btnWorkH.addEventListener (MouseEvent.CLICK, workClick);
function workClick (e:MouseEvent):void{
addChild (workO);
workO.x = 62.5;
workO.y = 109.3;
addChild (txtAmy);
txtAmy.x = 105.1;
txtAmy.y = 109.3;
}