private void queryOptionItem_Selected(object sender, EventArgs e)
        {
            QueryOptionItem selectedItem = sender as QueryOptionItem;

            if (selectedItem != null)
            {
                m_selectedItem = selectedItem;
            }

            OptionChanged.Raise(this, EventArgs.Empty);
        }
 private void childNode_OptionChanged(object sender, EventArgs args)
 {
     OptionChanged.Raise(sender, EventArgs.Empty);
 }