When having tabs and title bars integrated the way icons on the right upper corner are located is rather irritating. Sometimes the icons seem to be related to the whole group, sometimes they are not integrated and are located below. I suppose this is due to some of the windows having custom window controls and some standard windows title bars.
Example: I grouped 1 desktop app with standard title bar (mail client), 1 "windows store app" (calendar) and one app with custom window controls (Whatsapp) in order to have communications in one group. On every tab the location of the icons is different and on the mail client the icons seem to suggest that they close the whole group but really just close that tab.
Though I realize that this is difficult to realize, I think there needs to be some kind of standardization of appearance and function.
