Need help on sending keystrokes into a game window

SetTitleMatchMode, 3				;3: A window's title must exactly match WinTitle to be a match.

^q::						; This hotkey stops the loop below and asks for continuation.
	BreakLoop = 1
	MsgBox, 4, Mine Farmer, The script will now be stopped.`nAre you sure?
	IfMsgBox, Yes
		ExitApp
	Else
		BreakLoop = 0
Return

!f::
	Loop 
		{
		Sleep, 100
		ControlSend, , f, ahk_class LaunchUnrealUWindowsClient	;This line totally works fine if I use "Notepad"
		If BreakLoop = 1					;as the ahk_class, but seems to do nothing in the
			Break						;game window when using the games ahk_class
		If BreakLoop = 0
			Continue
		}
Return

#RequireAdmin


HotKeySet("{F1}", "_sendFkey")      ; key that start/pause bot
HotKeyset("{F9}", "_check_window")  ; key that check if window exists


Global $pause = False
Global $window = "window name" ; name of the window if this fail comment it and uncoment second $window variable
;~ Global $window = WinGetHandle("window name") ; this is second option if first fail uncoment this variable and comment first $window variable


While 1
    Sleep(100)
WEnd


; main function
Func _sendFkey()


    $pause = Not $pause


        While $pause


            ControlSend($window, "", "", "{F}") ; key
            Sleep(1000) ; pause, 1000 = 1 second


        WEnd
EndFunc ; => main function


Func _check_window()


    If WinExists($window) Then
        MsgBox(0, "Message", "Window exists.")
    Else
        MsgBox(0, "Error", "Window dont exists.")
    EndIf


EndFunc ; => check if window exists