Notifies the container that the object is about to be activated in place and
that the object is going to replace the container's main menu with an in-place
The container allows the in-place activation.
An unexpected error occurred.
Notes to Callers
The in-place object calls IOleInPlaceSite::OnUIActivate
just before activating its user interface.
Notes to Implementors
The container should remove any user interface associated with its own
activation. If the container is itself an embedded object, it should remove its
document-level user interface.
If there is already an object active in place in the same document, the
container should call IOleInPlaceObject::UIDeactivate
before calling OnUIDeactivate
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