UDO & Choose From List

I have a form I create and then tie it to a UDO ("NBS_MYUDO") using this line of code: oCP.ObjectType = "NBS_MYUDO". The form works great but I need to add a "Choose From List" to a field on the form. The Choose from will work only if I take out the "oCP.ObjectType = "NBS_MYUDO" line and make it a normal form not tied to the UDO.

Is this working by design or am I missing something that will enable a UDO form to have Choose from lists?

Thanks!