How to set the auto fit width on hover of ListGridField items.

Hi,
We have upgraded Smart Gwt-4.0p to Smart Gwt-4.1p(10 March 2015)
Browser : IE10, 11, Google Chrome: 43.0.2357.37 m.

How to set the auto fit width on hover of ListGridField items(title).
I have set the properities of listGridField.setShowHover(true);
But tooltip is displaying on multiple line.
I have set the properities listGrid.setHoverWidth(300) and listGrid.setHoverWrap(false) for Listgrid.

But in this case if title length is less then displaying big tootltip.

I want to set hover tooltip width as auto .

Thanks.