hi, I'm a newbie in FLASH 4 and to most people this sounds like a stupid questionb, but how do you chnage the background color of the work area thing?

like this is the work area:
(*s dontn count)

*___________________________________
|**********************************|
|**********************************|
|**********************************|
|**********************************|
|**********************************|
|**********************************|
|**********************************|
|**********************************|
____________________________________


and I want to change the background color


I know that this is off-topic, but in the ChitChat form, there is like openion questions

please help ASAP