Corner Points on Curves

 From:  TwinSnakes
502.1 
Michael,

Is there a way to "undo" the make corner point operation when using the "Add Point" tool? Or for that matter, toggle between "Corner Point" and "Non-Corner Point" when working with points on a curve.

I was laying down some curves and decided to soften a particular sharp edge I had made. So, I began to attempt a "Fillet". But, no matter WHAT I tried, it would not work. I then realized that it was a "corner" point. I added (2) intermediate points then deleted the corner points and everything was fine.

Any suggestions?