T-splines. Trouble converting NURBS planar surface into T-splines

Hey, guys

I have installed parallels and trying to play with t-splines and it seem like very promising in regards of my task. I have some difficulties converting surface from nurbs to t-splines using tsConvert.
I get square corners t-spline surface in smooth toggle mode like on the picture below. What am i doing wrong?

Thank you so much

19.3dm (58.4 KB)

Trimmed Nurbs surfaces lose their trimming when converting to t-splines. From the manual below.

Thank you, sochin
that is surprising information
i guess i was trying to cut the corners and skip t-splines manual, lol