change smooth point to edge on curve, and back

 From:  wimverbe
5448.1 
is it possible to change the smooth point of a curve to a corner, and the other way around? The way I do it now is by placing a new point very closely to the existing one, and then delete the old one, but that is a cumbersome technique, while the curve goes bezerk then, and has to be readjusted.

tnx
wim