# Flash Tutorial: Classes in ActionScript 3 - How to in flex

**URL:** <https://forum.kirupa.com/t/flash-tutorial-classes-in-actionscript-3-how-to-in-flex/280058>\
**Category:** flash\
**Created:** [January 22, 2009, 6:35am UTC](https://forum.kirupa.com/t/flash-tutorial-classes-in-actionscript-3-how-to-in-flex/280058 "2009-01-22T06:35:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cks1450](https://avatars.discourse-cdn.com/v4/letter/c/b5a626/32.png) [@cks1450](https://forum.kirupa.com/u/cks1450)\
**Post date:** [January 22, 2009, 6:35am UTC](https://forum.kirupa.com/t/flash-tutorial-classes-in-actionscript-3-how-to-in-flex/280058/1 "2009-01-22T06:35:09Z")

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So I bought a book to learn flex and AS3 but the thing got too diffucult to read. I searched and happened upon the tutorial and its great I am actually comprehending the concepts.  
But since I am in Flex, I am not building an .fla so what kind file should I put the codes samples in and are there needed changes ? I assume it should be an MXML titled classes and the name file remains a .as file.