WPF ComboBox SelectedItem not Updating

Question

I am facing a problem while working with a WPF ComboBox. My situation is that I have a ComboBox that is displaying some values. I am adding ContentControls to Combo

Answer 1

private void utc_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var items = e.AddedItems;
            ComboBoxItem utcSel = (ComboBoxItem)items[0];
            string utcStr = utcSel.Content.ToString();
        }