make checkbox clickable inside of a box

I added a checkbox to a chartbox with this code:

var newBox = '<input id="test" type="checkbox" value="test" data-dojo-type="dijit.form.CheckBox"/>';

        new window.EvmClasses.chartBox(_domnodeId, _portletId, {
        "htmlContent" : newBox + " Minuten bis zur automatischen Aktualisierung",
        "left" : 100,
        "top" : 0,
        "width" : 400,
        "height" : 25,
        "bgColorFrom" : "#ffffff",
        "bgColorTo" : "#ffffff",
        "color" : "#000000"
    });

it's working so far... but why can't I click the checkbox? Any suggestions? How can I realize a clickable checkbox?