How to take control of a variable (not component) from main controller?

<windows id="win" apply="pbz.ctrl.myWinController">
....
   <div id="div" apply="pbz.ctrl.myDivController">
      ----
  </div>
...
</windows>

now i have these controllers:

public myWinController extends GenericForwardComposer implements Serializable{  
  ........
}

public myDivController extends GenericForwardComposer implements Serializable{  
  private List<requerimientodetaVO> lista;
  ......
}