This rectangle is painted with a horizontal linear gradient

    
<UserControl x:Class='SilverlightApplication3.MainPage'
    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>
    <Canvas Width="200" Height="100">
      <Rectangle Width="200" Height="100">
        <Rectangle.Fill>
          <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
            <GradientStop Color="Yellow" Offset="0" />
            <GradientStop Color="Red" Offset="0.25" />
            <GradientStop Color="Blue" Offset="0.75" />
            <GradientStop Color="LimeGreen" Offset="1" />
          </LinearGradientBrush>
        </Rectangle.Fill>
      </Rectangle>
      <Line X1="1" Y1="50" X2="199" Y2="50" />
      <Path>
        <Path.Data>
          <GeometryGroup>
            <EllipseGeometry Center="0,50" RadiusX="4" RadiusY="4" />
            <EllipseGeometry Center="50,50" RadiusX="4" RadiusY="4" />
            <EllipseGeometry Center="150,50" RadiusX="4" RadiusY="4" />
            <EllipseGeometry Center="200,50" RadiusX="4" RadiusY="4" />
          </GeometryGroup>
        </Path.Data>
      </Path>
    </Canvas>

</UserControl>

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This rectangle is painted with a horizontal linear gradient : Rectangle « Shapes « Silverlight

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