CellList itself can not scroll. You need to put it into a ScrollPanel and give that ScrollPanel a fixed size.--
Even though you have set a fixed height to the CellList it is normal that you see list items outside of that defined height because in HTML overflowing content is always visible unless you tell the browser to hide it, see: http://jsfiddle.net/zb7nfk50/ .
The GWT showcase also has an example of an endless scrolling cell list. In that example the ScrollPanel itself acts as pager:
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