Call a VBA object in Matlab with Activex server.

Hello,

I already know we can call functions/subs from a VBA module within Matlab using activex server with this command: Excel.Application.Run('function_sub',var1,var2,...,varn).

Now I want to know if that's possible for Microsoft Excel Objects (the VBA code that's contained in the sheets, not a module).

Suppose I want to run the following code contained in Sheet1 (see image above):

Function sum(val1 As Single, val2 As Single) As Single
sum = val1 + val2
End Function

How can I do that?

Thanks for your time! :)