ComboBox ItemsSource changed => SelectedItem is ruined

Question

Ok, this has been bugging me for a while now. And I wonder how others handle the following case:

Answer 1

I just implemented a very simple override and it seems to be working visually, however this cuts off bunch of internal logic, so I'm not sure it's safe solution:

public class MyComboBox : ComboBox 
{
    protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
    {
        return;
    }
}

So if you use this control then changing Items/ItemsSource won't affect SelectedValue and Text - they will remains untouched.

Please let me know if you find problems it causes.