combgrid's panel first time has horizontal scroll bar

[James]

http://jsfiddle.net/wtvnb3gj/5/

fist time show it's panel, it has horizontal scroll bar, and vertical scroll bar is not display as it should be.
do not choice any item, and close the panel , then open it again, it dispaly right, how to make it dispaly ok at the first time?

[James]

I want to upload an gif(35KB) but server says:The upload folder is full. Please try a smaller file and/or contact an administrator.

[jarry]

After create the combogrid, please set the drop down panel with ‘overflow:hidden’ style.

Code:

        $('#groupicon').combogrid({
            required: true,
            editable: false,
            fitColumns: true,
            idField: 'iconname',
            textField: 'iconname',
            data: data,
            pagination: true,
            toolbar: '#toolbar',
            columns: [[
                    {field: 'id', hidden: true},
                    {field: 'iconname', title: 'ICON', width: 100, align: 'center'}
                ]]
        });
        $('#groupicon').combogrid('panel').css('overflow','hidden')