It's a bit of a hack, but since the cell list is just a list of Divs, you 
can use the CSS3 columns (but watch out, IE9 doesn't support this, and only 
the most recent version of opera does)

public void setColumns(int columns) {
    if(columns < 1) columns = 1;

    Style style = cellList.getElement().getStyle();
    String cols = String.valueOf(columns);
    /* You could used deferred binding here if you weren't lazy */
    style.setProperty("MozColumnCount", cols);
    style.setProperty("WebkitColumnCount", cols);
    style.setProperty("columnCount", cols);
}

public void setColumnPadding(int width) {
    if(width < 0) width = 0;

    Style style = cellList.getElement().getStyle();
    style.setProperty("MozColumnGap", width, Style.Unit.PX);
    style.setProperty("WebkitColumnGap", width, Style.Unit.PX);
    style.setProperty("columnGap", width, Style.Unit.PX);
}

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