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Using system colors to create gradients

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="SystemColorsAndBrushes_csharp.Window1"     Title="System Colors" >    <Window.Resources>     <Style TargetType="{x:Type Rectangle}">       <Setter Property="Margin" Value="10,0,10,0"/>       <Setter Property="HorizontalAlignment" Value="Left"/>       <Setter Property="Height" Value="20"/>       <Setter Property="Width" Value="120"/>       <Setter Property="Stroke" Value="Black"/>       <Setter Property="StrokeThickness" Value="1"/>     </Style>     <Style TargetType="{x:Type TextBlock}">       <Setter Property="Margin" Value="10,20,10,0"/>     </Style>     <Style TargetType="{x:Type Button}">       <Setter Property="Margin" Value="10,0,10,0"/>       <Setter Property="HorizontalAlignment" Value="Left"/>     </Style>     </Window.Resources>     <ScrollViewer>     <Grid>       <Grid.ColumnDefinitions>         <ColumnDefinition />         <ColumnDefinition Width="5" />         <ColumnDefinition />       </Grid.ColumnDefinitions>       <Grid.RowDefinitions>         <RowDefinition />       </Grid.RowDefinitions>       <Rectangle Grid.Column="1" Grid.Row="0"          HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Fill="Black"         RadiusX="10" RadiusY="10" />            <StackPanel Name="systemBrushesPanel" Background="White" Grid.Row="0" Grid.Column="0"/>        <StackPanel Name="gradientExamplePanel" Background="White" Grid.Row="0" Grid.Column="2"/>   </Grid>      </ScrollViewer> </Window> //File:Window.xaml.vb Imports System Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Documents Imports System.Windows.Navigation Imports System.Windows.Shapes Imports System.Windows.Data Namespace SystemColorsAndBrushes_csharp   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()       Dim t As New System.Windows.Controls.TextBlock()       t.Text = "System Color Gradient Examples"       t.HorizontalAlignment = System.Windows.HorizontalAlignment.Left       t.FontWeight = System.Windows.FontWeights.Bold       gradientExamplePanel.Children.Add(t)       t = New System.Windows.Controls.TextBlock()       t.Text = "ControlDark to ControlLight"       Dim r As New System.Windows.Shapes.Rectangle()       r.Fill = New System.Windows.Media.RadialGradientBrush(System.Windows.SystemColors.ControlDarkColor, System.Windows.SystemColors.ControlLightColor)       gradientExamplePanel.Children.Add(t)       gradientExamplePanel.Children.Add(r)       t = New System.Windows.Controls.TextBlock()       t.Text = "ControlDarkDark to ControlLightLight"       r = New System.Windows.Shapes.Rectangle()       r.Fill = New System.Windows.Media.LinearGradientBrush(System.Windows.SystemColors.ControlDarkDarkColor, System.Windows.SystemColors.ControlLightLightColor, 45)       gradientExamplePanel.Children.Add(t)       gradientExamplePanel.Children.Add(r)       ' Try it out on a button.       t = New System.Windows.Controls.TextBlock()       t.Text = "Desktop to AppWorkspace"       Dim b As New System.Windows.Controls.Button()       b.Width = 120       b.Height = 20       b.Background = New System.Windows.Media.RadialGradientBrush(System.Windows.SystemColors.DesktopColor, System.Windows.SystemColors.AppWorkspaceColor)       gradientExamplePanel.Children.Add(t)       gradientExamplePanel.Children.Add(b)       t = New System.Windows.Controls.TextBlock()       t.Text = "Desktop to Control"       b = New System.Windows.Controls.Button()       b.Width = 120       b.Height = 20       b.Background = New System.Windows.Media.RadialGradientBrush(System.Windows.SystemColors.DesktopColor, System.Windows.SystemColors.ControlColor)       gradientExamplePanel.Children.Add(t)       gradientExamplePanel.Children.Add(b)     End Sub   End Class End Namespace