PRB: ATL Object Wizard Cannot Add ATL Object to Existing File

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Steps to Reproduce

1. Create a new ATL COM AppWizard project using default options.
2. On the Insert menu, click New ATL Object.
3. Click Simple Object and then click Next.
4. In the ATL Object Wizard Properties dialog box, click the Names tab.
5. In the Short Name edit box, type obj1, and click OK.
   
   This creates Obj1.h and Obj1.cpp files in the project directory.
6. Repeat steps 2 to 4 above.
7. In the Short Name edit box, type obj2.
8. Change .H Name from Obj2.h to Obj1.h or .CPP Name from Obj2.cpp to Obj1.cpp. Click OK.