parameter changing problem

[goodbrother]

Hey guys!need some help here,i downloaded some gear with prt file from the gallery,however,when i changed the parameter, like the no.of teeth, and regenerate,the drawing remains the same.Anyone can help me out?

 

[goodbrother]

I havetried out all the gears in
http://www.mcadcentral.com/proe/files/gallery.asp?categoryid =11,
and Im usingproEwildfire 5