Hi,

>>
From searching google groups this seems to be because there is not an interface defined for the child object. However I thought as the COM .DLL created by VFP uses IDispatch (is this the same as late-binding?) rather than the TLB this wouldn't matter.
>>

The interface of a COM object is defined at compile time. Early/Late binding only determines when you access that interface. You can try something like:

DEFINE CLASS TopLevel AS CUSTOM OLEPUBLIC

  FUNCTION AddRef()
    LPARAMETERS cName,cClass
    THIS.ADDOBJECT(cName,cClass)
    RETURN EVALUATE("this."+cName)
  ENDFUNC

ENDDEFINE

DEFINE CLASS ChildClass AS CUSTOM
  Test = "Hello"
ENDDEFINE

then:

loCOMServer = CreateObject("ComServer.TopLevel")
oObj = loCOMServer.AddRef("oFred","ChildClass")
? oObj.Test

HTH,
Viv