diff --git a/src/VisVim/DSAddIn.h b/src/VisVim/DSAddIn.h
new file mode 100644
index 0000000..7282872
--- /dev/null
+++ b/src/VisVim/DSAddIn.h
@@ -0,0 +1,53 @@
+// DSAddIn.h : header file
+//
+
+#if !defined(AFX_DSADDIN_H__AC726715_2977_11D1_B2F3_006008040780__INCLUDED_)
+#define AFX_DSADDIN_H__AC726715_2977_11D1_B2F3_006008040780__INCLUDED_
+
+#include "commands.h"
+
+// {4F9E01C0-406B-11d2-8006-00001C405077}
+DEFINE_GUID (CLSID_DSAddIn,
+	0x4f9e01c0, 0x406b, 0x11d2, 0x80, 0x6, 0x0, 0x0, 0x1c, 0x40, 0x50, 0x77);
+
+/////////////////////////////////////////////////////////////////////////////
+// CDSAddIn
+
+class CDSAddIn :
+	public   IDSAddIn,
+	public   CComObjectRoot,
+	public   CComCoClass < CDSAddIn,
+		 &CLSID_DSAddIn >
+{
+    public:
+	DECLARE_REGISTRY (CDSAddIn, "VisVim.DSAddIn.1",
+			  "VisVim Developer Studio Add-in", IDS_VISVIM_LONGNAME,
+			  THREADFLAGS_BOTH)
+
+	CDSAddIn ()
+	{
+	}
+
+	BEGIN_COM_MAP (CDSAddIn)
+	COM_INTERFACE_ENTRY (IDSAddIn)
+	END_COM_MAP ()
+	DECLARE_NOT_AGGREGATABLE (CDSAddIn)
+
+	// IDSAddIns
+    public:
+	STDMETHOD (OnConnection) (THIS_ IApplication * pApp, VARIANT_BOOL bFirstTime,
+				  long dwCookie, VARIANT_BOOL * OnConnection);
+	STDMETHOD (OnDisconnection) (THIS_ VARIANT_BOOL bLastTime);
+
+    protected:
+	bool AddCommand (IApplication* pApp, char* MethodName, char* CmdName,
+			 UINT StrResId, UINT GlyphIndex, VARIANT_BOOL bFirstTime);
+
+    protected:
+	CCommandsObj * m_pCommands;
+	DWORD m_dwCookie;
+};
+
+//{{AFX_INSERT_LOCATION}}
+
+#endif // !defined(AFX_DSADDIN_H__AC726715_2977_11D1_B2F3_006008040780__INCLUDED)