How To Refresh Traytooltip Display ?

;
; When I hoover over the tray icon, the current time is displayed, but not updated until I move the mouse away and back.
; Is there a magic command to refresh the traytooltip display during hoovering ?
;
HotKeySet("{ESC}", "_ESC")
Func _ESC()
Exit
EndFunc ;==>_ESC
;
While Sleep(1000)
TraySetToolTip(@HOUR& ":" & @MIN & ":"& @SEC)
; insert the magic command here.
WEnd