Accelerator and Tab Keys Do Not Work

All,

I am using COM Interop with C# to display a modeless form via a COM call
from an application written in Visual studio C++ 6.0.
I can display the form as modeless however the accelerator and tab keys do
not work (arrow keys work).
Interestingly, if the form is modal the accelerator and tab keys work
properly.
Also if the same form is launched from a C# appication (not using COM) the
forms accelerator and tab keys work properly.

The form is a Class library (DLL) that has a COM interface.
There is a COM method that calls .Show() for the form.

Does anyone know how to get the accelerator and tab keys to work when calling
the form through COM?

Thanks in advance,
Scott