This is too funny....how about a RELEASE WINDOW "Class Designer" in the code line right after the CREATE CLASS?

>>Fred ----
>>

>>*** SUBCLASS.PRG
>>LPARMS cOldClass,cOldClassLib,cNewClass,cNewClassLib
>>CREATE CLASS &NewClass OF &cNewClassLib AS &cOldClass FROM &cOldClassLib NOWAIT
>>RETURN

>>
>>From the Command Window, type =Subclass("oldclass","oldlib","newclass","newlib")
>>The NOWAIT option on create class will work in code.
>>
>>
>Yes, but it STILL pops up the ClassDesigner. It just doesn't wait before executing the next line of code...