Toggle the position of a panel by decoupled handlers (for comparison with other approaches)

TogglePanelPositionHandlers.as

private var _nextMotion:Function = revealPanel;

private function togglePanelPosition(e:MouseEvent):void
{
	_nextMotion();
}

private function revealPanel():void
{
	moveTo(ON_STAGE_Y);
	_nextMotion = hidePanel;
}

private function hidePanel():void
{
	moveTo(OFF_STAGE_Y);
	_nextMotion = revealPanel;
}   

private function moveTo(yPos:Number):void
{
	TweenLite.to(this, 1, {y:yPos});
}