# Mask a movie clip? Not typical

**URL:** <https://forum.kirupa.com/t/mask-a-movie-clip-not-typical/200510>\
**Category:** flash\
**Created:** [September 12, 2006, 7:42pm UTC](https://forum.kirupa.com/t/mask-a-movie-clip-not-typical/200510 "2006-09-12T19:42:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![stevs102](https://avatars.discourse-cdn.com/v4/letter/s/2bfe46/32.png) [@stevs102](https://forum.kirupa.com/u/stevs102)\
**Post date:** [September 12, 2006, 7:42pm UTC](https://forum.kirupa.com/t/mask-a-movie-clip-not-typical/200510/1 "2006-09-12T19:42:53Z")

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Creating a training demo of an application build in Flash. I have a movieClip, say data\_mc, with drop downs, text fields etc. I want another movieClip, say mask\_mc, to lay on top so I can shade data\_mc with say a 50% alpha white but have a square that is transparent. I know this is not difficult but I wanted to make it dynamic enough so I can add keyframs and move the square easy enough.

any idea?