How to draw a rectangle with one different border

i want a rectangle with this measures left=50, top=20, rigth=50 and bottom=10 in XAML

Something like

thanks

UPDATE:

i want to create a Grid with that shape, i said grid because the control should contain other controls like an image and thi开发者_JAVA技巧s control should grow or shrink with the form.

The Shape you are showing is not a rectangle.

You'll need a Path to do this:

<Path Data="M0,0 L20,0 L10,50 L0,50 z"
      Fill="White" 
      Height="50" 
      Stroke="Black"
      Width="20"/>

You can do this with a Border:

<Border BorderBrush="Blue" BorderThickness="50 20 50 10"/>