I have trivial class:

<file MyClass.py>:

from OFS import SimpleItem
from Globals import DTMLFile

def manage_addMyClass(self, id, REQUEST):
"add"
a=MyClass(id)

self._setObject(id,a)

if REQUEST:
return self.manage_main(self, REQUEST)

manage_addMyClassForm=DTMLFile('dtml\manage_addMyClassForm',globals())

class MyClass(SimpleItem.SimpleItem):
"minimal object"

meta_type='MyClass'

    def __init__(self, id):
        "init"
        self.id=id

I can add objects of MyClass through ZMI.

How can I add some object through my own interface: for example, on button click on DTML form?

Regards,
Serg.