Workaround. MainForm -> Script: Ext.override(Ext.grid.column.RowNumberer, { defaultRenderer: function(value, metaData, record, rowIdx, colIdx, dataSource, view) { var newDataSource = dataSource.isFeatureStore ? dataSource.store : dataSource; return this.callParent([value, metaData, record, rowIdx, colIdx, newDataSource, view]); } });  
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