Part Isolation

When editing a part in the context of an assembly, all otherparts change to the transparent state I set in "Options". However,if I Isolate several components and then edit a part, I cannot getthe other pieces to change transparency. What's up with that? Thankyou

SW2007, SP 3.1
Intel Core 2 @ 2.66Ghz
2 GB Ram
FireGL V7100
SolidworksAssemblies