A class problem...With a little help of my friends

Hello everyone!
I have a little problem.
I have 3 classes.

1-) Main class.
2-) Enemy class. (a enemy that must b destroyed)
3-) Enemys bullet class. (the enemies bullet that will atempt to hit me).

How can i dispatch an event from the Enemy Class back to the Main class so the main class can add the enemies bullet on the screen?

Thanks!
Leo.:red: