Help: How to Mass Delete in Mail Trash?

I'm in Mail and my trash has about 80 deleted messages. I cannot figure out how to do a mass delete. Please don't tell me this has to be done one delete at a time. I've tried a few key strokes and mouse/key combinations, but obviously not the right ones.

Now, this is not in MAILBOXES, where a right click and Erase Deleted Items does the job.

This is under my 'GMAIL' box, which is linked to MAIL.

I can right click--erase deleted items there until I am blue in the face to no avail.