# Can I add dynamic properties to Movieclip in library?

**URL:** <https://forum.kirupa.com/t/can-i-add-dynamic-properties-to-movieclip-in-library/259101>\
**Category:** flash\
**Created:** [May 1, 2008, 4:00am UTC](https://forum.kirupa.com/t/can-i-add-dynamic-properties-to-movieclip-in-library/259101 "2008-05-01T04:00:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![johnlouis](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/johnlouis/32/568_2.png) [@johnlouis](https://forum.kirupa.com/u/johnlouis)\
**Post date:** [May 1, 2008, 4:00am UTC](https://forum.kirupa.com/t/can-i-add-dynamic-properties-to-movieclip-in-library/259101/1 "2008-05-01T04:00:20Z")

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Can I add dynamic properties to movieclips i attached from the library?  
like:  
my\_mc.customProperty:Number = 100;  
my\_mc.customProperty += 10;

i tried doing it that way, i got an error, but maybe i’m just doing it wrong.