context: function AddDataSources(){  accountManagerDataSource = accountManagerDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource);  folderDataSource = folderDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource);  //to move menu item  SetupMoveCopyMenus('moveMenu', accountManagerDataSource, folderDataSource);  //to copy menu item  SetupMoveCopyMenus('copyMenu', accountManagerDataSource, folderDataSource);  //To FileButton menu  SetupMoveCopyMenus('button-file', accountManagerDataSource, folderDataSource);  //To move and copy menus in message pane context  SetupMoveCopyMenus("messagePaneContext-copyMenu", accountManagerDataSource, folderDataSource);  SetupMoveCopyMenus("messagePaneContext-moveMenu", accountManagerDataSource, folderDataSource);  //Add statusFeedback  var msgDS;  var viewDataSources = [accountManagerDataSource, folderDataSource,                         unreadFolderDataSource, favoriteFoldersDataSource,                        recentFoldersDataSource];  for (index in viewDataSources)  {    msgDS = viewDataSources[index].QueryInterface(Components.interfaces.nsIMsgRDFDataSource);    msgDS.window = msgWindow;  }}
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