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Window glass, called Aero glass, is available since Windows Vista, with the WindowGlassActivator you can enable it.

Usage
<Window x:Class="DW.SharpTools.Demo.GlassWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowStartupLocation="CenterScreen"
Title="Glass Window"
Height="300"
Width="300">
<Grid>
</Grid>
</Window>
using System.Windows;
namespace DW.SharpTools.Demo
{
public partial class GlassWindow : Window
{
public GlassWindow()
{
InitializeComponent();
Loaded += new RoutedEventHandler(DemoWindow_Loaded);
}
private void DemoWindow_Loaded(object sender, RoutedEventArgs e)
{
WindowGlassActivator.ExtendGlassFrame(this);
}
}
}