[Oberon] FPGA - DIY Dialogs

[Tomas Kral]

> I recommend to read and study this description: PO.System.pdf
> Especially chapter 3 and 4

Doing my homework, message handlers unveil a lot more possibilities.
Message handling in my case sometimes lead to unintended effects,
such as mouse trailing its mark.

-- 
Tomas Kral <thomas.kral at email.cz>
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