Referencing a resource at design time. Notice the use of the StaticResource keyword.
<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'>
<Grid x:Name="LayoutRoot" Background="White">
<StackPanel x:Name="myStackPanel">
<StackPanel.Resources>
<SolidColorBrush x:Key="theSolidColorBrush" Color="Green" />
</StackPanel.Resources>
<TextBlock x:Name="myTextBlock" Text="Hello, World" Foreground="{StaticResource theSolidColorBrush}" />
</StackPanel>
</Grid>
</UserControl>
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