Showing thread of found message

Dear Benny

I have a common objective: to find a message based on some search criteria, and then to reveal all other messages in its thread. I used to be able to do this by:

1. using searchAllMessages;
   
2. selecting the appropriate message;
   
3. using showThread, which returns the subset of the thread meeting the search criteria;
   
4. Right clicking on the 'Custom Search' item in the header, and removing it.

Unfortunately, in a Mailmate version subsequent to around v4158, step 4 seems to have broken. I can no longer right click on the 'Custom Search' item as of v4374.

• If this is a bug, might it be fixed?
• Is there another way of achieving my objective?
• Could step 4 be achieved using the keyboard alone?

As always, enormous thanks for putting together such an excellent product: your time is much appreciated.

Kindest
Mike