Customize the built-in Outlook Select Names dialog (or any other)

using System;
using System.Collections.Generic;
using Outlook = Microsoft.Office.Interop.Outlook;
using Office = Microsoft.Office.Core;

namespace CustomOutlookDialog {

    internal class InspectorWrapper {

        public event EventHandler<Guid> InspectorClosed;

        public Guid ID { get; private set; }

        public Outlook.Inspector Inspector { get; private set; }

        public InspectorWrapper(Outlook.Inspector inspector) {
            Inspector = inspector;
            ConnectEvents();
        }

        void ConnectEvents() {
            ((Outlook.InspectorEvents_10_Event)Inspector).Close += new Outlook.InspectorEvents_10_CloseEventHandler(InspectorWrapper_Close);
            ((Outlook.InspectorEvents_10_Event)Inspector).Activate += new Outlook.InspectorEvents_10_ActivateEventHandler(InspectorWrapper_Activate);
            ((Outlook.InspectorEvents_10_Event)Inspector).Deactivate += new Outlook.InspectorEvents_10_DeactivateEventHandler(InspectorWrapper_Deactivate);
        }

        void DisconnectEvents() {
            ((Outlook.InspectorEvents_10_Event)Inspector).Close -= new Outlook.InspectorEvents_10_CloseEventHandler(InspectorWrapper_Close);
            ((Outlook.InspectorEvents_10_Event)Inspector).Activate -= new Outlook.InspectorEvents_10_ActivateEventHandler(InspectorWrapper_Activate);
            ((Outlook.InspectorEvents_10_Event)Inspector).Deactivate -= new Outlook.InspectorEvents_10_DeactivateEventHandler(InspectorWrapper_Deactivate);
        }

        void InspectorWrapper_Close() {
            DisconnectEvents();

            Inspector = null;
            GC.Collect();
            GC.WaitForPendingFinalizers();

            // inform the application to release al references.
            if (InspectorClosed != null) InspectorClosed(this, ID);
        }

        private IntPtr _invisibleWindow;

        private void InspectorWrapper_Activate() {
            if (_invisibleWindow != IntPtr.Zero) {

                // Close the invisible window
                WinApiProvider.PostMessage(_invisibleWindow, WinApiProvider.WM_CLOSE, 0, 0);

                FormRecipientDialog customDialog = new FormRecipientDialog(Inspector.CurrentItem);
                customDialog.ShowDialog();
            }
        }


        void InspectorWrapper_Deactivate() {
            int languageId = Inspector.Application.LanguageSettings.get_LanguageID(Microsoft.Office.Core.MsoAppLanguageID.msoLanguageIDUI);
            _invisibleWindow = WinApiProvider.SearchForAddressbookWindow(languageId);
        }


    }
}