how to change tray icon color?

like following fragment. code:
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If Ping('www.google.com', 500) Then
_ChangeTrayIconColor('DefaultColor')
Else
_ChangeTrayIconColor('GreyColor')
EndIf

Func _ChangeTrayIconColor($Color)
;.....how to write?
EndFunc
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Don't use TraySetIcon(), because my program has only one file: App.exe

If using <ModernMenuRaw.au3> to create trayicon, it can change the trayIcon color,  please tell me how to do ?