add: OnLeavingFolder(gMsgFolderSelected); 
context: function OnUnloadMessenger(){  accountManager.removeIncomingServerListener(gThreePaneIncomingServerListener);  pref.QueryInterface(Components.interfaces.nsIPrefBranchInternal);  pref.removeObserver("mail.pane_config.dynamic", MailPrefObserver);  pref.removeObserver("mail.showFolderPaneColumns", MailPrefObserver);  // FIX ME - later we will be able to use onload from the overlay  OnUnloadMsgHeaderPane();  OnMailWindowUnload();}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/b156509fe019c5f28ac1f74323af49e8232321ac/msgMail3PaneWindow.js/clean/mail/base/content/msgMail3PaneWindow.js