code: function ( force ) {
  
          if( !R.needReZone && !force ) return;
  
          var i = R.ui.length, u;
  
          while( i-- ){ 
  
              u = R.ui[i];
              R.getZone( u );
              if( u.isGui ) u.calcUis();
  
          }
  
          R.needReZone = false;
  
      }
docs: ---------------------- ZONE ----------------------