private void m_valueComboBox_CreatingEditor(object sender, EditEventArgs e)
{
var comboBox = (ComboBox) e.Control;
var closedFeatNode = (ClosedFeatureNode) e.Node.Tag;
comboBox.Items.Add(new SymbolicValue(null));
comboBox.Items.AddRange(closedFeatNode.Feature.ValuesOC.OrderBy(v => v.Abbreviation.BestAnalysisAlternative.Text).Select(v => new SymbolicValue(v)).Cast<object>().ToArray());
comboBox.SelectedItem = closedFeatNode.Value;
}