private void UnBindEvents()
 {
     if (activateEvent != null)
     {
         RlOutlook.ExplorerEvents_Event events = (RlOutlook.ExplorerEvents_Event)explorer;
         events.Activate   -= activateEvent;
         events.Deactivate -= deactivateEvent;
         events.Close      -= closeEvent;
     }
 }
 private void BindEvents()
 {
     RlOutlook.ExplorerEvents_Event events = (RlOutlook.ExplorerEvents_Event)explorer;
     activateEvent      = new Microsoft.Office.Interop.Outlook.ExplorerEvents_ActivateEventHandler(explorer_Activate);
     deactivateEvent    = new Microsoft.Office.Interop.Outlook.ExplorerEvents_DeactivateEventHandler(explorer_Deactivate);
     closeEvent         = new Microsoft.Office.Interop.Outlook.ExplorerEvents_CloseEventHandler(explorer_Close);
     events.Activate   += activateEvent;
     events.Deactivate += deactivateEvent;
     events.Close      += closeEvent;
 }