Slightly more robust.

gistfile1.txt

walkManagerChain( manager:any , event:any ):void{
  while( manager ){
    if( manager.hasOwnProperty( '_' + event.type ) ){
      manager[ '_' + event.type ]( event );
    }
    if( manager.hasOwnProperty( 'manager' ) ){
      manager = manager.manager;
    }else{
      return;
    }
  }
}