how to show a checkbox or radio button in grid v2.0b3

<xml id="xmlDataIsland">
<items>
    <item>
        <ck><![CDATA[<input type=radio checked=false name="rd1">]]></ck>
    </item>
</items>
</xml>
It can show a checkbox in AW v1.0, but in AW v2.0 b3 it can't, which way to show a checkbox with the xml dataIsland?