private void Button_Click_1(object sender, RoutedEventArgs e)
{
var crewMember = namesList.SelectedItem as Unit;
var item = memItems.SelectedItem as Item;
if (crewMember != null && memItems.SelectedItem != null)
{
AddOrChangeItem form = new AddOrChangeItem(mainwindow, item, crewMember);
form.ShowDialog();
}
}
