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copied!<p>I've found a solution, but it's not pretty. So far this is the <em>only</em> thing I've tried that actually works:</p> <pre><code>Window w = new Window(); // Create helper window w.Top = -100; // Location of new window is outside of visible part of screen w.Left = -100; w.Width = 1; // size of window is enough small to avoid its appearance at the beginning w.Height = 1; w.WindowStyle = WindowStyle.ToolWindow; // Set window style as ToolWindow to avoid its icon in AltTab w.Show(); // We need to show window before set is as owner to our main window this.Owner = w; // Okey, this will result to disappear icon for main window. w.Hide(); // Hide helper window just in case </code></pre> <p>Found it <a href="http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/8e3a788e-1e14-4751-a756-2d68358f898b/" rel="nofollow noreferrer">here</a>.</p> <p>A more general, reusable solution would be nice. I suppose you could create a single window 'w' and reuse it for all windows in your app that need to be hidden from the <kbd>Alt</kbd>+<kbd>↹Tab</kbd>.</p> <p><strong>Update:</strong> Ok so what I did was move the above code, minus the <code>this.Owner = w</code> bit (and moving <code>w.Hide()</code> immediately after <code>w.Show()</code>, which works fine) into my application's constructor, creating a public static <code>Window</code> called <code>OwnerWindow</code>. Whenever I want a window to exhibit this behavior, I simply set <code>this.Owner = App.OwnerWindow</code>. Works great, and only involves creating one extra (and invisible) window. You can even set <code>this.Owner = null</code> if you want the window to reappear in the <kbd>Alt</kbd>+<kbd>↹Tab</kbd> dialog.</p> <p>Thanks to Ivan Onuchin over on MSDN forums for the solution.</p> <p><strong>Update 2:</strong> You should also set <code>ShowInTaskBar=false</code> on <code>w</code> to prevent it from flashing briefly in the taskbar when shown.</p>

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