// Get a service used to work with express reports
var service = eaxDataBox.getService();
// Get data 
var doc = eaxDataBox.getSource();
// Set a new sheet add event handler
onSheetAdded = function (sender, args) {
    eaxDataBox.DataChanged.fire(this, new PP.Mb.Ui.PropertyChangedEventArgs({
        PropertyName: PP.Exp.Ui.ControlType.DataView,
        Metadata: null,
        TypeUpdateData: [PP.Exp.Ui.ViewTypeUpdate.Ribbon, PP.Exp.Ui.ViewTypeUpdate.PropertyBar, 
            PP.Exp.Ui.ViewTypeUpdate.Title]
    }));
};
// Add a new sheet to document
service.addSheet(doc, "Indicators", True, PP.Delegate(onSheetAdded, doc));
 
// Then refresh express report
eaxDataBox.refreshAll();