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    copied!<p>From <a href="http://msdn.microsoft.com/en-us/library/aa970493.aspx" rel="nofollow">MSDN</a>:</p> <blockquote> <p>In some cases, it might appear that you can't change the value of a property after it has been animated.</p> </blockquote> <p>You can solve this by adding new <code>Storyboards</code> to change <code>Width</code> property:</p> <pre><code>&lt;Style x:Key="WowButton" TargetType="Button" &gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="FontSize" Value="30"&gt;&lt;/Setter&gt; &lt;Setter Property="FontWeight" Value="Bold"&gt;&lt;/Setter&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsMouseOver" Value="False"&gt; &lt;Setter Property="Background" Value="Yellow"&gt;&lt;/Setter&gt; &lt;Setter Property="Width" Value="150"&gt;&lt;/Setter&gt; &lt;Setter Property="FontSize" Value="25"&gt;&lt;/Setter&gt; &lt;/Trigger&gt; &lt;EventTrigger RoutedEvent="Click"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:0.25" Storyboard.TargetProperty="Width" From="300" To="500 "&gt; &lt;/DoubleAnimation&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;EventTrigger RoutedEvent="UIElement.MouseEnter"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:0" Storyboard.TargetProperty="Width" From="150" To="300"/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;EventTrigger RoutedEvent="MouseLeave"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="(Button.RenderTransform).(RotateTransform.Angle)" From="0" To="360" RepeatBehavior="1x"&gt; &lt;/DoubleAnimation&gt; &lt;DoubleAnimation Duration="0:0:0" Storyboard.TargetProperty="Width" From="300" To="150 "/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre>
 

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