Uses a predefined SolidColorBrush, defined by the System.Windows.Media.Brushes class


   
      
            
<Window x:Class="WpfApplication1.ShapesWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="ShapesWindow" Height="160" Width="400">
  <Window.Resources>
    <Style TargetType="{x:Type Rectangle}">
      
      <!-- Gives all the rectangles in this panel a white stroke. -->
      <Setter Property="Stroke" Value="White"/>
      <Setter Property="StrokeThickness" Value="1"/>
    </Style>
  </Window.Resources>
    <Canvas>


      <Rectangle Width="50" Height="50" Fill="Blue" />
    </Canvas>
</Window>