public void Changer(object sender, SelectionChangedEventArgs e)
{
WpfDrinkzy.CustomerServiceRef.Customer c = (WpfDrinkzy.CustomerServiceRef.Customer)CustomerList.SelectedItem;
StorageList.ItemsSource = null;
List <WpfDrinkzy.StorageServiceRef.Storage> allProducts = new List <WpfDrinkzy.StorageServiceRef.Storage>();
allProducts.AddRange(sClient.GetAllDrinkStorage(c.ID).ToList());
allProducts.AddRange(sClient.GetAllAlchoholStorage(c.ID).ToList());
allProducts.AddRange(sClient.GetAllHelflaskStorage(c.ID).ToList());
StorageList.ItemsSource = allProducts;
}