Proportional Tiles

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Microsoft.Samples.Graphics.RectangleExample"
    WindowTitle="Example">
  <Canvas>

    <TextBlock Grid.Row="1" Margin="4">Proportional Tiles</TextBlock>
    <Rectangle Grid.Row="1" Grid.Column="1" Stroke="Aqua">
      <Rectangle.Fill>
        <ImageBrush ImageSource="c:\image.jpg" TileMode="Tile"
                    Viewport="0 0 0.2 0.2"></ImageBrush>
      </Rectangle.Fill>
    </Rectangle>
  </Canvas>
</Page>