async void DeleteVacationPeriodCommand(object VacPeriodData)
        {
            var periodToDelete = VacPeriodData as SpentVacations;

            if (periodToDelete == null)
            {
                return;
            }

            var confirmationPopup = new ConfirmationPopup("Delete this vacation period (" + periodToDelete.TotalDays.ToString() + " days) from " + periodToDelete.RefYear.ToString() + "?");
            await PopupNavigation.Instance.PushAsync(confirmationPopup);

            var result = await confirmationPopup.GetResult();


            if (result.Equals("true"))
            {
                this.Vacations.Remove(periodToDelete);
                await App.Database._spentVacations.DeleteSpentVacationsAsync(periodToDelete);

                await this.ExecuteLoadItemsCommand();
            }
        }