SolidColorBrush described using 8-digit hexadecimal notation.
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<!--
The first two digits describe the opacity of the color.
The remaining digits specify the amount of red, green, and blue in the color.
-->
<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}">
<Setter Property="Stroke" Value="White"/>
<Setter Property="StrokeThickness" Value="1"/>
</Style>
</Window.Resources>
<Canvas>
<Rectangle Width="50" Height="50" Fill="#FF0000FF" />
</Canvas>
</Window>
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