What steps will reproduce the problem? 1. Receive new update 2. When popup is displayed, press alt-tab 3. Popup window shows up in task switcher.

What is the expected output? What do you see instead? Witty new update popups should not show up in task switcher.

What version of the product are you using? On what operating system? 2.1, WinXP

Some analysis: WPF Windows with WindowStyle="None" will show up in the alt-tab task switcher. Changing to WindowStyle="ToolWindow" hides from switcher, but includes window chrome. It looks like the only way to hide them is to use an invisible ToolWindow container, which is gross but may be the only solution.

http://stackoverflow.com/questions/357076/best-way-to-hide-a-window-from-the-alt-tab- program-switcher