New trends in interface windows programs, the current behavior of the closure and to minimize incorrect. I think it would be correct that: the active icon in the system tray minimize - minimization as usual, at the close, minimize to tray.
Now, with the minimize, minimize to tray correctly. Single click - restores the window. When closing the cross - single click on the icon in the system tray - no result. It should work the same way.
I think it is more correct and is expected emergence window when you double-click at any parameters.
Sorry for bad english. Sincerely, a novice developer from Russia.