Here is the repaired post from the linked topic:
In split mode, the structure of grid’s container is more complicated, and direct change will not work as you wish. You can have layout like next
<div id="gridsize" style='width:100px; height:100px'>
<div id="gridbox" style='width:100%; height:100%'></div>
Now you can init the grid in #gridbox, and when necessary to change size you can just change styles of #gridsize and call grid.setSizes() to readjust grid to the new sizes. It must work in both normal and split modes.
Also the original topic post is repaired now