[flexcoders] Flex Builder 3 matching identifier highlighting

[m88e24]

Probably posted by someone but I can't seem to find it using the 
keywords I use. But does anyone know how to disable the highlighting 
of matching identifiers. You know when you cursor is positioned on a 
piece of code, all occurences of that code are highlighted. Sort of 
automatic search. I can't find how to turn this feature off. 
It is annoying and makes the cursor movement unresponsive. Please 
tell me how to turn it off and why isn't it off by default.
Thanks