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CHG Remove PlacementTarget assignment for popups and others. Did not provide advantages, but hid popups if taskbar owner isn't visible.
ADD Added double click command declaration.
git-svn-id: https://svn.evolvesoftware.ch/repos/evolve.net/WPF/NotifyIcon@83 9f600761-6f11-4665-b6dc-0185e9171623