In this way, you do can't add an object reffrence to form's property, but, if it is an visual control, you will not see it appear on the form.

I think the only way is :

do form myform with cClassName

myform.init:
set classlib to &cClassLib
this.addobject("oNewobjName",cClassName)
** or this.Newobject("oNewObjName", cClassName,cClassLib)