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Reloads your UI, notifying your group, setting AFK (which clears when you move when you're back anyway)
 /afk reloading UI
/run SendChatMessage("reloading my UI - afk for a sec", ((UnitInRaid("player")and "RAID")or(GetNumPartyMembers()>0 and "PARTY")or "AFK")); 
/console reloadui
 Use: Reload your UI, send a message to your party/raid telling them you're doing so and set an appropriate /afk message.
Credit: Ashel of Antonidas
Works in 3.2.0a