dhtmlxGrid undo/redo

I have the following code for undo/redo which doesn’t seem to work.

//Include script











mygrid_65.init();

var js_65 = {“rows”:[]}

mygrid_65.parse(js_65,“json”);

mygrid_65.enableUndoRedo();

The code above looks correct and must work correctly
Beware that undo|redo operations limited to cell edit actions only and can restore changes created by user actions only ( cell edit, block paste ) and can’t be used against changes made through API