unabled to prevent onSelectedRowsChanging in 2.5.1?

It seems that using the onSelectedRowsChanging to prevent selected rows from being changed doesn't work in version 2.5.1 - it works fine in 2.0.

obj.onSelectedRowsChanging = function(rows){
return 1;
}

I guess it is necessary to cancel rowSelected change as well -

obj.onSelectedRowsChanging = function(){return 1}
obj.onRowSelectedChanging = function(){return 1}