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copied!<p>I have modified the sample from 'LnDCobra' so it can be used as an attached property (as 'Thomas' suggested:</p> <pre><code><Window ... xmlns:i="clr-namespace:namespace-to-WindowEx" i:WindowEx.ShowIcon = "false" ... > </code></pre> <p>Implementation of WindowEx:</p> <pre><code>public class WindowEx { private const int GwlExstyle = -20; private const int SwpFramechanged = 0x0020; private const int SwpNomove = 0x0002; private const int SwpNosize = 0x0001; private const int SwpNozorder = 0x0004; private const int WsExDlgmodalframe = 0x0001; public static readonly DependencyProperty ShowIconProperty = DependencyProperty.RegisterAttached( "ShowIcon", typeof (bool), typeof (WindowEx), new FrameworkPropertyMetadata(true, new PropertyChangedCallback((d, e) => RemoveIcon((Window) d)))); public static Boolean GetShowIcon(UIElement element) { return (Boolean) element.GetValue(ShowIconProperty); } public static void RemoveIcon(Window window) { window.SourceInitialized += delegate { // Get this window's handle var hwnd = new WindowInteropHelper(window).Handle; // Change the extended window style to not show a window icon int extendedStyle = GetWindowLong(hwnd, GwlExstyle); SetWindowLong(hwnd, GwlExstyle, extendedStyle | WsExDlgmodalframe); // Update the window's non-client area to reflect the changes SetWindowPos(hwnd, IntPtr.Zero, 0, 0, 0, 0, SwpNomove | SwpNosize | SwpNozorder | SwpFramechanged); }; } public static void SetShowIcon(UIElement element, Boolean value) { element.SetValue(ShowIconProperty, value); } [DllImport("user32.dll")] private static extern int GetWindowLong(IntPtr hwnd, int index); [DllImport("user32.dll")] private static extern IntPtr SendMessage(IntPtr hwnd, uint msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] private static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle); [DllImport("user32.dll")] private static extern bool SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter, int x, int y, int width, int height, uint flags); } } </code></pre>

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