Disable All Controls

#include <GUIConstants.au3>

$hWnd = GUICreate("")
$cEdit = GUICtrlCreateEdit("", 5, 5, 200, 100)
$cButton = GUICtrlCreateButton("OK", 5, 210, 60, 20)
$cInput = GUICtrlCreateInput("Test", 210, 5, 80, 20)
GUISetState()
_DisableAllControls($hWnd, $cEdit, $cInput)

While GUIGetMsg() <> -3
WEnd

Func _DisableAllControls($hWnd_Disable, $cStart, $cEnd, $bDisable = True)
    GUISwitch($hWnd_Disable)
    For $iID = $cStart To $cEnd
        GUICtrlSetState($iID, $GUI_ENABLE * (1 + $bDisable))
    Next
EndFunc