How do you write a custom function in access vb that is available in expression builder ?

I would like to write a function in vb that is easily accessible from expression builder for a given query.
ie.  if my function in access vb is called myFunc ()  and takes a string and reverses the letters.
I would like to call the function from expression builer like the built in functions - eg. left(dbcolum,3)  
Ideally i would like to call myFunc(dbcolumn) and this would return that field with the letters reversed.

The above is only and example - please dont tell me there is a built in function that reverseres strings.

Thanks in advance
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You just need to make the function Public in a classic VBA module

Public Function StrReverse(strIn as string) as String
   'function code goes here
   StrReverse= 'computed string
End Function

Now you can use it in your SQL

Select StrReverse(yourcolumn) from yourtable

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