Modify ListGrid RowNumber width

Is it possible change the RowNumber width column in ListGrid? For large values, the content can't be displayed correctly.

Is SmartClient but not Smart GWT.

SmartClient Version ：v9.0p_2013-08-06 (2013-08-06)
OS/browsers: Windows 7/ Firefox 27.0.1

Thanks

Attached Images

rownumbers.png (8.6 KB)