Calling a function

1

In my application in the first frame I have the following: this is a simplified version,


import com.Menu.Menu;
import com.Papervision.Papervision;

//add menu to stage
 var m : Menu = new Menu()
 m.x = selectSpace.x
 m.y = selectSpace.y  + selectSpace.height
 addChild(m)

I have two AS files, one for the Menu and one for Papervision

In my Menu.as file I have


package com.Menu {
    public class Menu extends MovieClip {
          private function m_down(e:MouseEvent) {
            addRoom();
          }
}

In the Papervision.as file I have


package com.Papervision{
    public class Floor extends MovieClip {
        public function addRoom() {
           //do some stuff
         }
   }
}

My question is I get a compile error in the application:
1180: Call to a possibly undefined method addRoom.

Can someone explain to me how you call function from another AS file?