I am having the same problem. I noticed that you did not have a NextGrid 5 update after the above original post. Is there a fix?
At this point I am still very hesitant to convert a grid from NextGrid5 to 6 which I use as a template in my program and then set its properties and columns from those stored in a database.
That Nextgrid5 template is used in literally hundreds of grids. Does the NextGrid6 correct this issue? Can you point to code that would correct this problem?
Would changing to a ComboBox column fix this? Anything else?