I have written the ActiveX control in ATL, which uses pointers to
interfaces(IDispatch of  VBExtender) of others controls placed on the same
Visual Basic Form.
How can I know that  in OLE container(Visual Basic's Form) was added or
removed an ActiveX control to update my list of pointers  ?
List of pointers to interfaces was created in implementation of
IPerPropertyBrowsing::GetPredefinedStrings.

Thanks...

       With best regards...
             This letter was written by Alex Fedorov