void Edit()
{
var editcardialog = new EditCarItem()
{
DataContext = this
};
editcardialog.ShowDialog();
ViewModel.Instance.Requery();
}
void AddCar()
{
var car = new Car();
var editCarDilaog = new EditCarItem()
{
DataContext = car
};
editCarDilaog.ShowDialog();
// Let's just requery for now, as there are so many possibilities else.
Requery();
}