Activate MDI window

[mesajflaviu]

So what started out as a post wondering why focus can't be set on an MDI application has now turned into a single instance tray notify application?
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I'll try to make a test project. The same result I got if I notify the user with a random system tray balloon and user click to that balloon, the behavior is the same. So, the issue is the same as I posted first time. I give you this extra details in order to have a clear image about this issue, that is all.