Partial Title Match on Child Window Activate Function

Hello, new to AutoIt.   As far as I can tell, there is no direct way to activate a child window.  

The following function will correctly activate the child window, however, the child window text needs to be an exact match.

WinTitleMatchMode does not seem to apply or help in this case.

Thanks for any help!

#include <WinAPI.au3>
Func ChildActivate($appTitle, $formName)
AutoItSetOption("WinTitleMatchMode", 2)
$hWnd = WinGetHandle($appTitle, $formName)
$array = WinList($appTitle)
WinActive($hWnd)
$winarray = _WinAPI_EnumWindows(True, $hWnd)
For $i = 1 to $winarray[0][0]
	 $title = _WinAPI_GetWindowText($winarray[$i][0])
	 If ($title == $formName) or ($title == $formName & " *") Then
		 _WinAPI_ShowWindow($winarray[$i][0], @SW_MAXIMIZE)
		 _WinAPI_ShowWindow($winarray[$i][0], @SW_SHOWNORMAL)
	 EndIf
Next
EndFunc

EDIT for clarification:  WinTitleMatchMode will only apply to the Main Window in:   ChildActivate("Main Window", "Child Window")