How to associate activex component to an Invisible window

Hi all,

I have a Mainapplication.exe which calls a .dll.

In the .dll i am using an .ocx(Activex component).To make activex
component work i have to associate it to a window.
In the .dll i have associated activex component with
MainApplication.exe window and everything is working fine.

Now my new requirement is that:- In the .dll i have to associate
activex component(.ocx) to some new Invisible

window and not the Mainapplication.exe and make it work in the same
way when the Mainapplication.exe calls the .dll.

please help me in how to do it....

Language can be VC++ or C#

Best Regards,
Nithin