splitAt not working when grid is in container

I have a basic grid which is in a form container. When using the splitAt function, the horizontal scroll does not appear at all. Example attached. Thanks in advance the help!
test_container.zip (568 KB)

Please, try to call setSizes() method after adding the rows to the grid.

for (var i = 1; i < 101; i++) { rid = dhxGridDetail.uid(); dhxGridDetail.addRow(rid, [i, "A", "Water", "Blue", "B", 10, 20, "Good", "Yellow", true, false, true, 25, 10, "abc", "def", "ghi", 10, 20, 30, 2, 3]); } dhxGridDetail.setSizes()

thanks! splitAt now works after the setSizes call