[Zope] None returned from manage_edit

<dtml-var "myDTML_Method.manage_edit(data, title)"> returns 'None'. It saves content correctly, but why is "None" displayed? And how do I stop it from displaying? 2-fer: What is the syntax to replace myDTML_Method with its id? <dtml-var "id.manage_edit(data, title)"> gives me an AttributeError/class Cachable has no attribute "namemanage_edit". I tested and <dtml-var id> displays the correct value, but how do I call the object via a property using id with manage_edit? TFTH, Trevor