Dynamic masking help

1

I am trying to create a dynamic mask but I don’t see that the mask is working.


//create a mask to cover the room container
var roomMask:Sprite = new Sprite();
roomMask.graphics.beginFill(0xFF0000);
roomMask.graphics.drawRect(414, 89, 559, 361);
addChild(roomMask);
roomContainer.mask = roomMask;

    //set room location
roomContainer.x=414;
roomContainer.y= 89;
roomContainer.width = 559;
roomContainer.height = 361;
addChild(roomContainer);