# Trouble masking dynamic objects

**URL:** <https://forum.kirupa.com/t/trouble-masking-dynamic-objects/293781>\
**Category:** Uncategorized\
**Created:** [August 3, 2009, 7:54pm UTC](https://forum.kirupa.com/t/trouble-masking-dynamic-objects/293781 "2009-08-03T19:54:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FPG](https://avatars.discourse-cdn.com/v4/letter/f/8797f3/32.png) [@FPG](https://forum.kirupa.com/u/FPG)\
**Post date:** [August 3, 2009, 7:54pm UTC](https://forum.kirupa.com/t/trouble-masking-dynamic-objects/293781/1 "2009-08-03T19:54:55Z")

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Hello,

In my current project I’m building a waterfall. Each drop in the waterfall is generated from the waterfall.as class and added to the stage via addchild. Now I have a mask that I want all of those drops to use however I can’t seem to get this to work. I’ve tried placing the mask on the timeline and I couldn’t seem to access the mask from the waterfall.as file. I’ve also given the mask it’s own class and added it dynamically to no avail.

Any suggestions?