private void CustomCombo_LostFocus(object sender, KeyboardFocusChangedEventArgs e) { ComboBox Obj = sender as ComboBox; RatingCategory ObjItem = Obj.SelectedItem as RatingCategory; if (ObjItem != null) Obj.Text = ObjItem.Name; else Obj.Text = ""; if (Obj.Text.Length > 0 && Custom1Combo.Text == Custom2Combo.Text) Obj.Text = ""; }