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    <p>It works when you animate the Background/Fill Property directly, using the name of the object (e.g. Rectangle) you want to animate as Storyboard.TargetName:</p> <pre><code>&lt;Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;Grid.Resources&gt; &lt;LinearGradientBrush x:Key="Outline" EndPoint="0.5,1" StartPoint="0.5,0"&gt; &lt;GradientStop Color="#7F7CE3FF" Offset="0"/&gt; &lt;GradientStop Color="#7F047695" Offset="1"/&gt; &lt;GradientStop Color="#FFFFFFFF" Offset="0.942"/&gt; &lt;/LinearGradientBrush&gt; &lt;/Grid.Resources&gt; &lt;Border Name="border" Background="{StaticResource Outline}" Width="200" Height="200" /&gt; &lt;/Grid&gt; &lt;Window.Triggers&gt; &lt;EventTrigger RoutedEvent="Window.Loaded"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="border" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Offset)"&gt; &lt;SplineDoubleKeyFrame KeyTime="00:00:0" Value="0"/&gt; &lt;SplineDoubleKeyFrame KeyTime="00:00:1" Value="1"/&gt; &lt;/DoubleAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;/Window.Triggers&gt; </code></pre> <p></p> <p><strong>Edit</strong></p> <p>From code behind it seems to be totally possible:</p> <p>XAML:</p> <pre><code>&lt;Grid Name="grid"&gt; &lt;Grid.Resources&gt; &lt;LinearGradientBrush x:Key="Outline" EndPoint="0.5,1" StartPoint="0.5,0"&gt; &lt;GradientStop Color="#7F7CE3FF" Offset="0"/&gt; &lt;GradientStop Color="#7F047695" Offset="1"/&gt; &lt;GradientStop Color="#FFFFFFFF" Offset="0.942"/&gt; &lt;/LinearGradientBrush&gt; &lt;/Grid.Resources&gt; &lt;Border Background="{StaticResource Outline}" Width="100" Height="100" HorizontalAlignment="Left" /&gt; &lt;Border Background="{StaticResource Outline}" Width="100" Height="100" HorizontalAlignment="Right" /&gt; &lt;/Grid&gt; </code></pre> <p>C# code behind:</p> <pre><code> LinearGradientBrush b = grid.Resources["Outline"] as LinearGradientBrush; b.GradientStops[0].BeginAnimation(GradientStop.OffsetProperty, new DoubleAnimation(0, 1, new Duration(TimeSpan.FromSeconds(1)))); </code></pre>
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    1. POHow to animate a resource in XAML?
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    1. COYep, this works, but I have multiple shapes using that brush, so I thought I could do it all at once.
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      1. USRoman Plášil
    2. COAs I said, I don't think it is possible to animate objects that are stored in the resources.
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    3. COI added another sample, where I animate the brush via code-behind. This seems to be no problem at all.
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