Problem with ControlGetHandle

[beefy66]

Hi,

I'm having problems getting a control handle from a form, and hoping for some advice.  I would definitely call myself a newbie to AutoIt, but can't figure this out!  I am using v3.1.1 of AutoIT (The newer versions are picked up as a virus! so I am restricted to the older versions for now)

Local $hWnd = WinGetHandle("Setup")
Local $hCtrl = ControlGetHandle($hWnd,"",8)
ControlClick($hWnd,"",$hCtrl)

The AutoIt Windows Info shows

Class:ThunderRT6CommandButton

Instance: 6

ClassNameNN:ThunderRT6CommandButton6

ID:8

Text:&Next >

 

If I add Message boxes I get a handle for the Window, but not for the control.  I have tried various other variations with ControlGetHandle to make this work, Such as

Local $hCtrl = ControlGetHandle($hWnd,"","[CLASS:ThunderRT6CommandButton; ID:8]")

Local $hCtrl = ControlGetHandle($hWnd,"","[CLASS:ThunderRT6CommandButton; INSTANCE:6]")

Local $hCtrl = ControlGetHandle($hWnd,"","[CLASSNN:ThunderRT6CommandButton6]")

To get past this particular setup page, I just used ControlSend to send Alt+N, but I have lot's of other pages in this setup where I need to be able to interact with the controls.  Can anybody help?