Accessing functions problem

[Businesstoast]

(May involve flashpunk.) I have a function advanceLevel() in MyGameWorld. MyGameWorld creates the player and the level. I want to call advanceLevel() inside the player with a line like this:

MyGameWorld.advanceLevel();

But, I get an error like this:

"Error: Call to a possibly undefined method advanceLevel through a reference with static type Class."

How do I access this function?

[Poony]

Relative to the player, the function exists in parent.

MovieClip(parent).advanceLevel();