title: Not able to update row data in ag-grid angular
body: <p>I am not able to update row data using rowNode.setDataValue('key','value').</p>
  
  <pre><code>    gridApi: GridApi;
  gridOptions: GridOptions = {
      frameworkComponents: {
          buttonRenderer: GridActionsComponent,
          customTooltip: CustomTooltip
      },
      onGridSizeChanged: (event: GridSizeChangedEvent) =&gt; {
          this.onGridSizeChanged(event);
      },
      onGridReady: (event: GridReadyEvent) =&gt; {
          this.gridApi = event.api;
      },
  };
  
  updateRowData(data) {
      const rowNode = this.gridApi.getRowNode('0');
      rowNode.setDataValue('status', 'active'); // here is throwing error as undefined
  }
  </code></pre>