We just add the following code to our component class to expose the thing as
a COM object.  We don't modify it at all.  Just use it as is.  I'm not
certain if this is what you are looking for but it might.

#region COM registration code

[ComRegisterFunction()]

public static void RegisterClass ( string key )

{

// Strip off HKEY_CLASSES_ROOT\ from the passed key as I don't need it

StringBuilder sb = new StringBuilder ( key ) ;

sb.Replace(@"HKEY_CLASSES_ROOT\","") ;

// Open the CLSID\{guid} key for write access

RegistryKey k = Registry.ClassesRoot.OpenSubKey(sb.ToString(),true);

// And create the 'Control' key - this allows it to show up in

// the ActiveX control container

RegistryKey ctrl = k.CreateSubKey ( "Control" ) ;

ctrl.Close ( ) ;

// Next create the CodeBase entry - needed if not string named and GACced.

RegistryKey inprocServer32 = k.OpenSubKey ( "InprocServer32" , true ) ;

inprocServer32.SetValue ( "CodeBase" ,
Assembly.GetExecutingAssembly().CodeBase ) ;

inprocServer32.Close ( ) ;

// Finally close the main key

k.Close ( ) ;

}

[ComUnregisterFunction()]

public static void UnregisterClass ( string key )

{

StringBuilder sb = new StringBuilder ( key ) ;

sb.Replace(@"HKEY_CLASSES_ROOT\","") ;

// Open HKCR\CLSID\{guid} for write access

RegistryKey k = Registry.ClassesRoot.OpenSubKey(sb.ToString(),true);

// Delete the 'Control' key, but don't throw an exception if it does not
exist

k.DeleteSubKey ( "Control" , false ) ;

// Next open up InprocServer32

RegistryKey inprocServer32 = k.OpenSubKey ( "InprocServer32" , true ) ;

// And delete the CodeBase key, again not throwing if missing

k.DeleteSubKey ( "CodeBase" , false ) ;

// Finally close the main key

k.Close ( ) ;

}

#endregion