Keeping "trough" points of a spline in editing ...

 From:  Heiner (BILDERMENSCH)
6264.1 
Hi there,
one thing which always gives me problems is the work with splines which use "trough points":
While you create them, they are there and all is fine, but when you later start to edit the spline
the "trough pints" are gone and instead there are the usual controll points outside of the spline.
Is there a way to keep the "trough points" even after the spline has been created, in editing?
Best regards
Heiner