A rectangle with a linear fill
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SolidColorBrush Animation Example"
Background="White">
<StackPanel>
<Rectangle RadiusX ="15" RadiusY ="15" Height ="40" Width ="100">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
<GradientStop Color="LimeGreen" Offset="0.0" />
<GradientStop Color="Orange" Offset="0.25" />
<GradientStop Color="Yellow" Offset="0.75" />
<GradientStop Color="Blue" Offset="1.0" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</StackPanel>
</Window>
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