code: function(store, initial) {
          var me = this;
          me.mixins.bindable.bindStore.apply(me, arguments);
          store = me.store;
          if (store && store.isLoading()) {
              me.onBeforeLoad();
          }
      }
docs: Changes the data store bound to this LoadMask.
  @param {Ext.data.Store} store The store to bind to this LoadMask