I have been involved with Genero for over 20 years but even now there are occasions where I learn of some functionality that when I investigate has been there for a number of years.
In this case a question was asked why were they seeing a splitter that allowed them to resize elements inside a GRID. We knew that there was the SPLITTER attribute that enabled you to resize stretchable children of HBOX/VBOX but were unaware of such an attribute inside a GRID container.
What we learnt was that there was a feature called “Automatic HBox/VBox with splitter“, and this had been in the product since version 2.02.
Read more at
https://4js.com/ask-reuben/ig-243/