6.13.4 Release of a DTM User Interface
If the Frame Application wants to release a presentation object of a DTM it first has to prepare the release
by sending a notification to the presentation object. After the IDtmActiveXControl::PrepareToRelease()
method the presentation object must release all its connections to other components and can call DTM
specific de-initialization methods.

Used methods:
Standard Microsoft
IDtmActiveXControl::PrepareToRelease()
IDtmEvents::OnApplicationClosed()
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