#include <GUIConstantsEx.au3>
 
$hGui = GUICreate("Gui", 200, 200)
$hInput = GUICtrlCreateInput("", 10, 10, 70, 20)
GUISetState()
 
While 1
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            Exit
        Case $GUI_EVENT_PRIMARYUP
            $aInfo = GUIGetCursorInfo()
            If $aInfo[4] = $hInput Then MsgBox(0, "Test", "Test")
    EndSwitch
WEnd