Getting formEditor tag to work

[hookmac123]

I am trying to get the formEditor element to work in an XML-only Zimlet. The Zimlet below doesn't give me a form when I click on a matched string.

<zimlet name="com_mydomain_test" version="1.0" description="Our Test Zimlet">
  <contentObject>
    <matchOn>
      <regex attrs="ig">elephant</regex>
    </matchOn>

    <toolTip>Our Test Tool Tip</toolTip>

    <onClick>
      <formEditor name="smsForm">
        <field type="string" name="phoneNo" label="ABC" maxLength="14"/>
        <field type="string" name="message" label="CDE" visualType="textArea" maxLength="120" numLine="10"/>
      </formEditor>
    </onClick>

  </contentObject>

</zimlet>