When I open an Excel Application via VBA the Analysis ToolPac functions are
not loaded. (Specially I want to see the function "EDATE" but there are
others nice functions.)

VBA:
Dim appWB As Excel.Application

Set appWB = CreateObject("Excel.Application")
appWB.Workbooks.Open Filename:="c:\mydocs\myXLWB.xls", ReadOnly:=False
appWB.Visible = True

Even when I set the addins property to True they are not recognized:

'Install Analysis Tool pack
AddIns("Analysis ToolPak").Installed = True

Any Suggestions?

Thank you,
Mark