The version of TX Text Control is a special OEM version that was in PB 12.6, and to the best of my knowledge no significant change was made in PB 12.6 compared to PB 12.5 regarding this control. Just to clarify, since this is special OEM version it is neither the X14 nor the new X16 versions.
If for some reason you really want to purchase and use the X16 version you can do so by embedding it as an ActiveX control in your app. However, our recommendation for customers that would like the smoothest migration process possible is to use the built-in TX Text Control, and I believe that is the new default option now.