private async Task OpenTimerAsync(IntervalTemplate item)
 {
     var nav = new NavigationParameters
     {
         { nameof(IntervalTemplate), item }
     };
     await NavigationService.NavigateAsync("TimerPage", nav, useModalNavigation : true);
 }
        private async Task OnIntervalTemplateChangeAsync(IntervalTemplate item)
        {
            if (item.IsNew)
            {
                var id = await IntervalService.AddItemAsync(Mapper.Map <IntervalTemplateDto>(item));

                item.Id = id;
                IntervalTemplates.Insert(0, item);
            }
            else
            {
                await IntervalService.UpdateItemAsync(Mapper.Map <IntervalTemplateDto>(item));
            }
        }