// обработка нажатия кнопки добавления
private async void CreateCostCat(object sender, EventArgs e)
{
CostCat costCat = new CostCat();
CostCatPage costCatPage = new CostCatPage
{
BindingContext = costCat
};
await Navigation.PushAsync(costCatPage);
}
// обработка нажатия элемента в списке
private async void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
{
CostCat selectedCostCat = (CostCat)e.SelectedItem;
CostCatPage costCatPage = new CostCatPage
{
BindingContext = selectedCostCat
};
await Navigation.PushAsync(costCatPage);
}