4.md

index.js

var scrollGridController = {
  __name: 'datagrid.sample.ScrollGridController',

  __meta: {
    _gridController: {
      rootElement: '#grid'
    }
  },    
  _gridController: datagrid.GridController,
  _dataSearcher: null, // 追加
  :
  __ready: function() {
    :
    this._gridController.activate(dataSource, initParam);
    // 以下を追加
    this._dataSearcher = this._gridController.getDataSearcher();
    :
  }