graphic behavior

[David Thompson]

>Strange graphic behavior:  I can change the color of a locked 
>rectangle, but I cannot change the Fill Pattern without first 
>unlocking.  Bug?

It sounds like one to me. You shouldn't be able to change its color. 
According to page 554 of the handbook

A locked object cannot be moved, resized, or have any of its 
attributes (color, fill pattern, etc.) changed. However, you can 
duplicate the object (the copy is not locked).

Dave