I want to call a function according the value of a combobox

Let's say my combo is filled with
"code39"
"code41"
"code52"
"code53"

Now i want to execute the function related to the chosen comboitem

Function names are

make_file_code39
make_file_code41
make_file_code52
make_file_code53

tried it with "make_file_" & cmbCode.Value

no luck till now.