It seems to be defined in the csproj file. If I add the following line to the PropertyGroup-Section, I can do what I'm looking for:
<ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
note
Although I found the location where definiton is located, I did not use a modified version of csproj-File. I created a new project with the desired settings. It seems that there are many additional project parameters between the management library and the class library, and perhaps only adding the above commands can lead to unexpected project / solution behavior.
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