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Use Customized LinearGradientBrush to paint a Rectangle

<Window x: Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="WPF" Height="100" Width="300">     <Grid>         <Grid.Resources>             <LinearGradientBrush x:Key="VisibleSpectrumBrush" StartPoint="0,0" EndPoint="1,0">                 <GradientStop Color="Red" Offset="0.15" />                 <GradientStop Color="Orange" Offset="0.2" />                 <GradientStop Color="Yellow" Offset="0.35" />             </LinearGradientBrush>         </Grid.Resources>         <StackPanel>             <Rectangle Height="30" Width="280" Fill="{StaticResource VisibleSpectrumBrush}" />         </StackPanel>     </Grid> </Window>