private void button_Drinks_Click(object sender, EventArgs e)
{
DrinksKind form = new DrinksKind(ChoosenItems, order);
form.FormClosed += new FormClosedEventHandler(NewOrder_FormClosed);
this.Hide();
form.Show();
}
void NewOrder_FormClosed(DrinksKind sender)
{
ChoosenItems = sender.ChoosenItems;
this.additems(ChoosenItems);
this.Show();
}