Calling class-functions

I have a problem accessing a memberfunction of a class I made.

Simplified, this is the class:

 
class class_ANIMATION {
  
  // Define variables here 

  // Constructor here
  
  // Member functions here:
  function cfn_Play():Void{
	trace ("cfn_Play was called"); 
  }
}

This creates the class-instance cl_AVATAR:

 
var cl_AVATAR:class_ANIMATION = new class_ANIMATION();

So far so good. Heres where the problem arises - when trying to call the member-function cfn_Play() from the FLA-file:

 
cl_AVATAR.cfn_Play();

That should work, right?