protected async void Add_Clicked(object sender, EventArgs e)
        {
            var page = new LeaveRequestEditPage();

            page.BindingContext = new LeaveRequestEditViewModel(viewModel.ForUser, null);
            await((MainPage)App.Current.MainPage).NavigateTo(page, true);
        }
        private async System.Threading.Tasks.Task editLeaveRequest(LeaveRequest request)
        {
            var page = new LeaveRequestEditPage();

            page.BindingContext = new LeaveRequestEditViewModel(viewModel.ForUser, request);
            await((MainPage)App.Current.MainPage).NavigateTo(page, true);
        }