Comment 9 for bug 1780670

@Jeff - I can't seem to get back to the netclass values after changing to custom with this commit. I start routing, switch to custom and the values change as expected. Going back to netclass does not work.

Also, we've lost the menu option for editing custom values. It seems we can re-click on the checkbox to get the menu but this is counter-intuitive and I can't seem to find it anywhere else. Maybe when the custom values are checked, there is a context menu item underneath that has the "edit custom differential pair options"?