Hide/Unhide Grid Columns

This is actually per request of my very first subscriber MK Sharma.  So he was looking for a tool to hide/unhide grid columns on-the-ply that he asked me if this can be incorporated on the ssUltimate library.   I said okay I will look into it but I was busy with simultaneous projects these days that I kept shoving it at the back of my mind.

Finally I became a bit free of my workload and so I decided to work on this one today.  I did not realize adding this feature will not require a lot of my time that I kept unnecessarily putting this request on hold thinking I will do it later when I am free, which happens today; as it is hard to concentrate on extra things when you are already working on 3 projects simultaneously.

Anyway, that feature now is part of GridSortLock class.  So this means said class can now Sort, Lock and Hide/Unhide columns of the grid.  Here are some images of it: