Irregular Shaped Windows in WPF

Window1.cs

public partial class Window1 : Window
{
  public Window1()
  {
    InitializeComponent();
  }
  private void Window_MouseDown(object sender, MouseButtonEventArgs e)
  {
    if (e.ChangedButton == MouseButton.Left)
      DragMove();
  }
  private void mnuExit_Click(object sender, RoutedEventArgs e)
  {
    Close();
  }
  private void mnuMinimize_Click(object sender, RoutedEventArgs e)
  {
    WindowState = WindowState.Minimized;
  }
}

Window1.xaml

<Window x:Class="MyFunSample.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MyFunSample"
        AllowsTransparency="True"
        WindowStyle="None"
        Background="Transparent"
        ResizeMode="CanMinimize"
        MouseDown="Window_MouseDown">
  <Window.ContextMenu>
    <ContextMenu>
      <MenuItem Header="Minimize" Name="mnuMinimize" Click="mnuMinimize_Click"/>
      <MenuItem Header="Exit" Name="mnuExit" Click="mnuExit_Click"/>
    </ContextMenu>
  </Window.ContextMenu>
  <Border CornerRadius="20,20,20,20" Background="Cornsilk"/>
</Window>