If you create a new MFC project in a new solution, you cannot develop ATL EXE projects in that same solution.
You can add the new ATL project, but if you try to add a 'ATL Simple Object' to the project, you get the message 'ATL Simple object can only be added to MFC EXE or MFC Regular DLL with full ATL support' if you use VS2008SP1
With VS2010CTP, you nothing special happens, but the dialog for
creating the ATL simple object never appeared and subsequently although I can access the 'Add' menu item from the Class View pane, the "Class" sub-menu is now in an
active state and nothing happens
If I try to close the IDE I get:
"Microsoft Visual Studio cannot shut down because a modal dialog is
active. Close the active dialog and try again.
".. but there isn't any visible dialog I can do anything with :)
(Thank you David Lowndes for reproducing this)