Juan,
I just tried this with no problem. In the method in the vfp mtdll, I put in:
oAVFP.ADDPROPERTY('hello',2)
The method is called from a bare-bones ASP script. This is VFP 6 SP5. Alternatively, you could just say something like THIS.hello = 2 ...

>I create a COM server that I use in ASP web page.
>
>The problem is that in my class have a method tha use the method ADDPROPERTY() that add to my object new properties in run time, when I create the object with VB scripting language in my ASP page and prove to access the new properties added at run time, the ASP page return the following error:
>
>run-time error of Microsoft VBScript (0x800A01B6)
>Property or method not supported by the object
>
>Any want experience the same situacion and can help me
>
>Thanks