@Override
    public boolean getWordWrap() {
        return !WhiteSpace.NOWRAP.getCssName().equals(getElement().getStyle().getWhiteSpace());
    }
Determines whether this check box is currently checked.
<p>
Note that this <em>does not</em> return the value property of the checkbox
input element wrapped by this widget. For access to that property, see
{@link #getFormValue()}

@return <code>true</code> if the check box is checked, false otherwise.
Will not return null
stroom-core-client-widget/src/main/java/stroom/widget/tickbox/client/view/CustomCheckBox.java