#include <GUIConstantsEx.au3>
#include <GuiMenu.au3>
#include <WinAPIError.au3>
#include <WindowsConstants.au3>

Global Enum $e_idOpen = 1000, $e_idSave, $e_idInfo

Example()

Func Example()
        ; Create GUI
        GUICreate("Menu", 400, 300)
        GUISetState(@SW_SHOW)

        ; Register message handlers
        GUIRegisterMsg($WM_COMMAND, "WM_COMMAND")
        GUIRegisterMsg($WM_CONTEXTMENU, "WM_CONTEXTMENU")

        ; Loop until the user exits.
        Do
        Until GUIGetMsg() = $GUI_EVENT_CLOSE
EndFunc   ;==>Example

; Handle WM_COMMAND messages
Func WM_COMMAND($hWnd, $iMsg, $wParam, $lParam)
        #forceref $hWnd, $iMsg, $lParam
        Switch $wParam
                Case $e_idOpen
                        _WinAPI_ShowMsg("Open")
                Case $e_idSave
                        _WinAPI_ShowMsg("Save")
                Case $e_idInfo
                        _WinAPI_ShowMsg("Info")
        EndSwitch
EndFunc   ;==>WM_COMMAND

; Handle WM_CONTEXTMENU messages
Func WM_CONTEXTMENU($hWnd, $iMsg, $wParam, $lParam)
        #forceref $hWnd, $iMsg, $lParam
        Local $hMenu

        $hMenu = _GUICtrlMenu_CreatePopup()
        _GUICtrlMenu_InsertMenuItem($hMenu, 0, "Open", $e_idOpen)
        _GUICtrlMenu_InsertMenuItem($hMenu, 1, "Save", $e_idSave)
        _GUICtrlMenu_InsertMenuItem($hMenu, 3, "", 0)
        _GUICtrlMenu_InsertMenuItem($hMenu, 3, "Info", $e_idInfo)
        _GUICtrlMenu_TrackPopupMenu($hMenu, $wParam)
        _GUICtrlMenu_DestroyMenu($hMenu)
        Return True
EndFunc   ;==>WM_CONTEXTMENU