# How to change class variable from inside a movie clip

**URL:** <https://forum.kirupa.com/t/how-to-change-class-variable-from-inside-a-movie-clip/309083>\
**Category:** flash\
**Created:** [May 6, 2010, 2:01pm UTC](https://forum.kirupa.com/t/how-to-change-class-variable-from-inside-a-movie-clip/309083 "2010-05-06T14:01:32Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Nim](https://avatars.discourse-cdn.com/v4/letter/n/67e7ee/32.png) [@Nim](https://forum.kirupa.com/u/Nim)\
**Post date:** [May 6, 2010, 2:01pm UTC](https://forum.kirupa.com/t/how-to-change-class-variable-from-inside-a-movie-clip/309083/1 "2010-05-06T14:01:32Z")

</div>

I declare a Boolean variable in my main class (Main.as file)

```auto
public var myboolean:Boolean;

```

What I want is to change myboolean variable from inside a movie clip I’ve got on stage (when it reaches a certain frame).

I write

```auto
myboolean = true;

```

but what I get is “Access of undefined property”

How should I write this?

(the variable is accessible from Stage)