Outlook 2011: “Show Reply” button missing after setting up Gmail

I recently re-set up Gmail to work with my copy of Outlook for Mac 2011.  In the past, if I replied to a message, I would see a button called "Show Reply" while viewing the original message.  Since re-setting up Gmail, however, that button has disappeared.  How can I re-enable it?

Here's what I used to see:

Here's what I now see:

Thanks for any and all help.