# Dynamic masking help

**URL:** <https://forum.kirupa.com/t/dynamic-masking-help/302354>\
**Category:** Uncategorized\
**Created:** [December 28, 2009, 4:36pm UTC](https://forum.kirupa.com/t/dynamic-masking-help/302354 "2009-12-28T16:36:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Navarone](https://avatars.discourse-cdn.com/v4/letter/n/f9ae1b/32.png) [@Navarone](https://forum.kirupa.com/u/Navarone)\
**Post date:** [December 28, 2009, 4:36pm UTC](https://forum.kirupa.com/t/dynamic-masking-help/302354/1 "2009-12-28T16:36:03Z")

</div>

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

```auto

//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);

```