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I would suggest to use C++ for this. Note that a module must have the same export signature as a gauge (Linkage and ImportTable).In order to capture the FSMain window and add your menu there is an running example in the avsim library "FSMenu.zip" (really i don't remember the author). This is done with the use of SetWindowLong. Furthermore, you can built a form using MFC(CDialog,CWindow etc) or W32 Flat API (CreateWindowEx etc). I would suggest MFC if you are using Visual Studio.