What's with those blank taskbar buttons that go away when I click on them?
Sometimes you'll find a blank taskbar button that goes away when you click on it. What's the deal with that? There are some basic rules on which windows go into the taskbar. In short: (Though the ITaskbarList interface muddies this up a bit.) When a taskbar-eligible window becomes visible, the taskbar creates a button for it. When a taskbar-elig...