Application.VBE.CommandBars.FindControl(ID:=2188). Execute

If I wish to execute my own function when the user selects the option:
FileSend toMail Receipient (as attachment)... the Correct ID # is 2188,
but how do I tell it to run "MySub" instead? The above line gives me an
error # 1004. Perhaps the OnAction will work, but I don't understand the
syntax for it. Thanks.