AT:L 3 and IDispatch

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Subject: ATL 3 and IDispatch Problem

Category: COM

The problem I have is this.

I have an IDispatch for an ATL 3.0 com object from which I want to derive the underlying Class. This will allow me to envoke a number of public methods in the class which have NOT been exposed in the interface. i.e. Load and Save in particular. If the project was based on MFC the a call to CCmdTarget::FromIDispatch would work, not for ATL 3. Can anyone give me any Ideas.

Thanks in advance.
Martyn