whole_func_string: function() {
          var me = this,
              i = 0,
              items = me.items,
              surface = me.getSurface(),
              len = me.length;
          
          if (surface) {
              for (; i < len; i++) {
                  surface.renderItem(items[i]);
              }
          }
          return me;
      }
func_code_string: function() {
          var me = this,
              i = 0,
              items = me.items,
              surface = me.getSurface(),
              len = me.length;
          
          if (surface) {
              for (; i < len; i++) {
                  surface.renderItem(items[i]);
              }
          }
          return me;
      }
func_documentation_string: Force redraw of all sprites.