[Lazarus] How to PostMessage to object?

[Krzysztof]

Hi,

How can I PostMessage from thread to another object? PostMessage/SendMessage
need HWND as parameter but this kind of handle is only in visual controls
(TWinControl, TForm). I temporary can use TWinControl type instead of
TObject but it need parent window to handle messages. Exists any cross
platform solution for this? I found only this article for windows (I can't
find "DefWindowProc" in lazarus)
http://www.delphidabbler.com/articles?article=1

Regards.
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