This rectangle is painted with a diagonal 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" EndPoint="1,1">
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="White" Offset="0.6" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="Black" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Line X1="1" Y1="1" X2="199" Y2="99" />
<Path>
<Path.Data>
<GeometryGroup>
<EllipseGeometry Center="0,0" RadiusX="4" RadiusY="4" />
<EllipseGeometry Center="50,25" RadiusX="4" RadiusY="4" />
<EllipseGeometry Center="150,75" RadiusX="4" RadiusY="4" />
<EllipseGeometry Center="200,100" RadiusX="4" RadiusY="4" />
</GeometryGroup>
</Path.Data>
</Path>
</Canvas>
</UserControl>
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