datagrid for vertical scrollbar display question

[zhinly]

I have a question for datagrid verticla scroolbar, set its this:
$("#cvCheck-grid").datagrid({
            url:"../../customer/visit/getPageVisit.action",
            rownumbers:true,
            singleSelect:true,
            autoRowHeight:true,
            pagination:true,
            pageSize:30,
            pageSizeField:'limit',
            //pageList : [ 30 ],
            toolbar:'#toolbar',
            idField:'id',
            striped: true,
            fitColumns: true,
            fit: true,
            loadFilter: function(data){
               if(data == null) return;
               else
                return {
                    total: data.data.pagination.totalCount,
                    rows: data.data.result == null ? [] : data.data.result
                }
            }
});
the question: when my data count the less than the panel's height, its should be not show the vertical scrollbar. But unfortunately, the vertical scrollbar row still show,  not hesitate to set the datagrid's style: "overflow" to "hidden",but it‘s not effect.
should be what to do?
thanks!

[Pierre]

Old question but same problem - does someone solved it (for better understanding, I attached image).
Tree control works perfect but DataGrdi and TreeGrid - not.
Thank you for any idea.

[roberto]

it would very nice to get this feature working