The STACK container was first introduced with Genero Mobile between the 2.50 and 3.00 releases of Genero Enterprise. It was always listed as “This feature is experimental, the syntax/name and semantics/behavior may change in a future version.”. Its lineage can also be traced back to the “Form” layout what was in GDC 2.20 Experimental Features. With Genero Enterprise 4.00, STACK was removed. As with the last article on ListView, the new responsive syntax is seen as being the successor to STACK.
There are a few options as to how you should code your screens that may have used STACK. One is to replace with a GRID. This will require adding in LABEL fields for the equivalent of TITLE.
Click here
https://4js.com/ask-reuben/ig-110/ to read more.