Simply open the MoveAnything-window (command is /move). Then you hover your mouse over the according MinimapButton (eg. the one for Guild Events), and the look what's shown under "MouseOver:".
To get an better idea of what I'm talking about, take a look at this screenshot (here the command would be "/move CritLineButton"):
http://ui.worldofwar.net/images/ui/1...Untitled-1.gif
Greetz,
Farook