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    <p>The reason is that you specify a <code>From</code> on your <code>DoubleAnimation</code>s.</p> <p>If the radius is anything less than 100 when <code>MouseLeave</code> happens, the <code>From</code> property will make it jump up to 100 and likely cause a <code>MouseEnter</code>. Then, you have two competing animations and the mouse events go crazy as the ellipse radius flickers underneath the cursor.</p> <p>The solution is to just omit the <code>From</code> properties, this will cause the animation to start from wherever the current radius is:</p> <pre><code>&lt;Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1"&gt; &lt;Canvas&gt; &lt;Path Margin="15,15,15,15" Fill="Blue"&gt; &lt;Path.Data&gt; &lt;!-- Describes an ellipse. --&gt; &lt;EllipseGeometry x:Name="MyAnimatedEllipseGeometry" Center="200,100" RadiusX="15" RadiusY="15"/&gt; &lt;/Path.Data&gt; &lt;Path.Triggers&gt; &lt;EventTrigger RoutedEvent="UIElement.MouseEnter"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="MyAnimatedEllipseGeometry" Duration="0:0:.5" Storyboard.TargetProperty="RadiusX" To="100"/&gt; &lt;DoubleAnimation Storyboard.TargetName="MyAnimatedEllipseGeometry" Duration="0:0:.5" Storyboard.TargetProperty="RadiusY" To="100"/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;EventTrigger RoutedEvent="UIElement.MouseLeave"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="MyAnimatedEllipseGeometry" Duration="0:0:.5" Storyboard.TargetProperty="RadiusX" To="15"/&gt; &lt;DoubleAnimation Storyboard.TargetName="MyAnimatedEllipseGeometry" Duration="0:0:.5" Storyboard.TargetProperty="RadiusY" To="15"/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;/Path.Triggers&gt; &lt;/Path&gt; &lt;/Canvas&gt; &lt;/Page&gt; </code></pre> <p>On an unrelated note, when you set <code>Storyboard.Duration</code>, it won't speed up your child animations, it will just end the <code>Storyboard</code> prematurely. You really want to set <code>Duration</code> on your child <code>DoubleAnimation</code>s - I've modified the XAML above to do this.</p>
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    1. USRobert Macnee
    1. USRobert Macnee
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    1. COThanks Robert. That worked very well. Can I ask what the difference is, then, between setting the Storyboard Duration and the DoubleAnimation duration?
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      1. USRyan Cromwell
    2. COor more appropriately, when should Storyboard.Duration be set versus DoubleAnimation.Duration
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    3. COI think it's mostly when the entire Storyboard has RepeatBehavior set, you can reset it at a particular time interval using Duration.
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