/// <summary>
        /// Occurs when this command is clicked
        /// </summary>
        public override void OnClick()
        {
            try
            {
                GetApplicationServices();

                IFeatureLayer fl = m_appServices.GetLayerSelectedInTOC();

                if (fl != null)
                {
                    AlterClassExtension(fl.FeatureClass);
                }
                else
                {
                    m_appServices.SetStatusMessage("Couldn't attach the 'custom inspector' extension. No feature layer was selected in the Table of Contents.", true);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: Could open the feature class. Original error: " + ex.Message);
            }
        }