I have written an ActiveX DLL in VB. It displays a form as modeless.
My colleague has written a VC++ client to use my DLL, but when he tries to
run it he gets the error:

Non-modal forms cannot be displayed in this host application from an
ActiveX DLL, ActiveX Control or Property Page.

It works OK if I change to modal, but we need to be able to do it modeless.

Anyone got an idea ?

Regards,

The only way I know of to get this working is for the Visual C++ program to
license and use Microsoft VBA.  The VB documentation indicates that the
client application must have the "VBA Technology Logo" in order for this to
work.