# Mask problem

**URL:** <https://forum.kirupa.com/t/mask-problem/298421>\
**Category:** Uncategorized\
**Created:** [October 18, 2009, 9:20pm UTC](https://forum.kirupa.com/t/mask-problem/298421 "2009-10-18T21:20:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MRPLC](https://avatars.discourse-cdn.com/v4/letter/m/9fc29f/32.png) [@MRPLC](https://forum.kirupa.com/u/MRPLC)\
**Post date:** [October 18, 2009, 9:20pm UTC](https://forum.kirupa.com/t/mask-problem/298421/1 "2009-10-18T21:20:50Z")

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Hi all,

I’m having a rather strange problem with my mask (a mask with a radial fill that alpha’s out to 0 at the edges). It masks a fairly large movieclip (2100px height), called container\_mc, that contains my pages.

Within the container\_mc, on my ‘about’ page, there are two movieclips with roll over/out functions. Whenever these functions occur, the container\_mc mask seemingly shrinks (although the movieclips with the functions don’t get too affected).

When I use a solid fill mask, I don’t get the problem. I think the problem revolves around the fact that the buttons are partially masked (albeit very very slightly). I’m quite stumped as to how to rectify the problem, and I would really like the alpha mask effect to work.

Does anyone know if it is possible to solve this?

Cheers.