gistfile1.txt

function SaveGridAsync() {
    ClearErrors();

    var myPromises = $(".open-sub-grid").map(function (i, o) {
        var subGridData = $(o).data("kendoGrid");
        return subGridData.dataSource.sync();
    }).get();

    return $.when.apply($, myPromises)
        .then(function () {
        console.log('my code is very good and cool!');
        var grid = $("#CostTypeList").data("kendoGrid");
        return grid.dataSource.sync();
    });
}
    
function AddRow() {
    var grid = $("#CostTypeList").getKendoGrid();

    if (GridHasDirtyChildGrid(grid)) {
        SaveGridAsync().then(function () { grid.addRow(); });
    } else {
        grid.addRow();
    }
}