dataIndex

{"calculate":"function(data){return data.tf_fpAmount-data.tf_fpYiPayoffJe}", "persist":true}
onGridCellDblClick: function (grid, td, cellIndex, record, tr, rowIndex, e) {
//e.position.column.dataIndex

var me = this, field = grid.headerCt.columnManager.getColumns()[cellIndex].dataIndex,
    rowdblclick = me.getView().getViewModel().get('gridSets.grid.rowdblclick');