Exporting to Excel - Documentation is incomplete

Grid Excel export toolbar on click method:

public toolbarClick = (args: ClickEventArgs) => {
    if (this.grid && args.item.id === 'grid_excelexport') {
        this.grid.excelExport();
    }
  }

This was taken from the documentation, except that, args.item.id is 'grid_excelexport' only if the grid id is "grid", if I don't set grid ID or in the case of a child grid, the grid ID is dynamic and it is not possible to intercept the call.