Problem with ListGrid resizing

I'm using SmartClient version v90p_2013-09-20_LGPL.
My problem occurs when I resize the browser window. I have a ListGrid with a SectionStack above it, and when the browser was resized, the ListGrid was resized to a small size than the SectionStack. I setted a minimum width to the ListGrid, with the value of the width of the SectionStack, avoiding this issue. But, if I already have the window resized to a small width, and open the ListGrid, it appears resized to a width smaller than the SectionStack. The point is that I don't want this kind of behavior. The ListGrid must be with the same width, no matter the size of the browser window, giving me the browser scrollbar.
Another important point is that I can't set a absolute width (this solved the problem).
It occurs at all browsers.

Thanks!