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copied!<p>If you want to use the Aero blur then you can use the <strong><a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa969508%28v=vs.85%29.aspx" rel="noreferrer">DwmEnableBlurBehindWindow</a></strong> api. Here's an example derived Window that utilizes this.</p> <pre><code>public class BlurWindow : Window { #region Constants private const int WM_DWMCOMPOSITIONCHANGED = 0x031E; private const int DWM_BB_ENABLE = 0x1; #endregion //Constants #region Structures [StructLayout( LayoutKind.Sequential )] private struct DWM_BLURBEHIND { public int dwFlags; public bool fEnable; public IntPtr hRgnBlur; public bool fTransitionOnMaximized; } [StructLayout( LayoutKind.Sequential )] private struct MARGINS { public int cxLeftWidth; public int cxRightWidth; public int cyTopHeight; public int cyBottomHeight; } #endregion //Structures #region APIs [DllImport( "dwmapi.dll", PreserveSig = false )] private static extern void DwmEnableBlurBehindWindow(IntPtr hwnd, ref DWM_BLURBEHIND blurBehind); [DllImport( "dwmapi.dll" )] private static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMargins); [DllImport( "dwmapi.dll", PreserveSig = false )] private static extern bool DwmIsCompositionEnabled(); #endregion //APIs #region Constructor public BlurWindow() { this.WindowStyle = System.Windows.WindowStyle.None; this.ResizeMode = System.Windows.ResizeMode.NoResize; this.Background = Brushes.Transparent; } #endregion //Constructor #region Base class overrides protected override void OnSourceInitialized(EventArgs e) { base.OnSourceInitialized( e ); if ( Environment.OSVersion.Version.Major >= 6 ) { var hwnd = new WindowInteropHelper( this ).Handle; var hs = HwndSource.FromHwnd( hwnd ); hs.CompositionTarget.BackgroundColor = Colors.Transparent; hs.AddHook( new HwndSourceHook( this.WndProc ) ); this.InitializeGlass( hwnd ); } } #endregion //Base class overrides #region Methods #region InitializeGlass private void InitializeGlass(IntPtr hwnd) { if ( !DwmIsCompositionEnabled() ) return; // fill the background with glass var margins = new MARGINS(); margins.cxLeftWidth = margins.cxRightWidth = margins.cyBottomHeight = margins.cyTopHeight = -1; DwmExtendFrameIntoClientArea( hwnd, ref margins ); // initialize blur for the window DWM_BLURBEHIND bbh = new DWM_BLURBEHIND(); bbh.fEnable = true; bbh.dwFlags = DWM_BB_ENABLE; DwmEnableBlurBehindWindow( hwnd, ref bbh ); } #endregion //InitializeGlass #region WndProc private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if ( msg == WM_DWMCOMPOSITIONCHANGED ) { this.InitializeGlass( hwnd ); handled = false; } return IntPtr.Zero; } #endregion //WndProc #endregion //Methods } </code></pre> <p>And here's a snippet of using the BlurWindow.</p> <pre><code>var w = new BlurWindow(); w.Width = 100; w.Height = 100; w.MouseLeftButtonDown += (s1, e1) => { ((Window)s1).DragMove(); e1.Handled = true; }; w.Background = new SolidColorBrush( Color.FromArgb( 75, 255, 0, 0 ) ); w.Show(); </code></pre>

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