@Override
    public void setValue(Boolean value) {
        setValue(value, false);
    }
Checks or unchecks the check box.
<p>
Note that this <em>does not</em> set the value property of the checkbox
input element wrapped by this widget. For access to that property, see
{@link #setFormValue(String)}

@param value true to check, false to uncheck; null value implies false
stroom-core-client-widget/src/main/java/stroom/widget/tickbox/client/view/CustomCheckBox.java