Vbscript WinTitleMatchMode problem

[CyberMax]

This script below works

Set oAutoIt = WScript.CreateObject("AutoItX3.Control")
Call oAutoIt.Opt("WinTitleMatchMode", 2)


If oAutoIt.WinExists("note") Then
    WScript.Echo "Window exists"
End If

but this script below dont works

Set oAutoIt = WScript.CreateObject("AutoItX3.Control")
Call oAutoIt.Opt("WinTitleMatchMode", -2)


If oAutoIt.WinExists("note") Then
    WScript.Echo "Window exists"
End If

What did I do wrong here? I need it to be case insensitive so that I can match any title irregardless of the lowercase or uppercase of the same title.

Please help. Thank you.

[CyberMax]

Tonite is April 1st, any news regarding my problem here? Thank you

[CyberMax]

Well, today October 20, 2013, more than a year now, any solution to my problem above.

Thank you.