modelling turtle__need help!!

A simple problem needs a simple solution!!!
I have a problem with the tutle that I´m currently modeling.

Those cute little green boxes that indicate the handles of my Bezier Corners just disapperared. The tangents are left, but I can´t work on without handles
It´s really disturbing!

Can anyone tell me how I can bring those green boxes back??

I forgot to tell you that I work in 3ds max!