HI,
I can see Tuttle's posted pic.
There is no link in his post.
With a black Desktop to provide not distraction he has posted the Window menu of Messages and highlighted the Buddies item. (Also brought into view by the keystroke CMD + 1)
However if you have multiple accounts in the Messages app Menu > Preferences> Accounts (such as Enabling the Bonjour one and having and AIM one) then the "Buddies" item is a combined List.
Go to the General Section of the Preferences and untick the item about gathering them into one list - which will separate them. You will now have several titles of Buddy Lists in the Window menu each with it's own keystrokes.


9:04 PM Saturday; November 24, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously