Steve,
Go into the properties of the base view and uncheck the 'associative' box.
Leaving this checked allows component visibility to be controlled by a view rep in the .iam.
By unchecking the box, you can control component visibility with a RMB on the part in the drawing browser.
HTH,
MarkC
Edit: Bjorn beat me to it. Great minds think alike :-)
Edited by: MarkC-UK on May 20, 2010 10:43 AM