title: Button Styling OuterGlowBitmapEffect -> DropShadowEffect
body: <p>In .NET 3.5 I used OuterGlowBitmapEffect on MouseOver event and it worked perfect.</p>
  
  <p>Now I'm moving to .NET 4.0 and there does not working - is deprecated, so I rewrote my code to DropShadowEffect.</p>
  
  <p>It works, but there is long delay between mouse over and animation start - about 500ms. Does anyone know why please? Or what am I doing wrong? </p>
  
  <p>Style:</p>
  
  <pre><code>&lt;Style x:Key="Button" TargetType="{x:Type Button}"&gt;
  &lt;Style.Setters&gt;
      &lt;Setter Property="Effect"&gt;
          &lt;Setter.Value&gt;
              &lt;DropShadowEffect ShadowDepth="0" Color="Yellow" BlurRadius="800" RenderingBias="Performance" Opacity="0" /&gt;
          &lt;/Setter.Value&gt;
      &lt;/Setter&gt;
  &lt;/Style.Setters&gt;
  &lt;Style.Triggers&gt;
      &lt;Trigger Property="Button.IsMouseOver" Value="True"&gt;
          &lt;Trigger.EnterActions&gt;
              &lt;BeginStoryboard&gt;
                  &lt;Storyboard&gt;
                      &lt;DoubleAnimation Storyboard.TargetProperty="Effect.Opacity" From="0" To="1" By="1" BeginTime="0:0:0" Duration="0:0:0" /&gt;
                      &lt;DoubleAnimation Storyboard.TargetProperty="Effect.Opacity" From="1" To="0" By="1" BeginTime="0:0:1" Duration="0:0:0" /&gt;
                  &lt;/Storyboard&gt;
              &lt;/BeginStoryboard&gt;
          &lt;/Trigger.EnterActions&gt;
      &lt;/Trigger&gt;
  &lt;/Style.Triggers&gt;
  </code></pre>
  
  <p></p>
  
  <p>And button:</p>
  
  <pre><code>&lt;Button Content="B1" Canvas.Left="207" Canvas.Top="321" Height="70" Name="btn1" Style="{StaticResource Button}" Width="380" /&gt;
  </code></pre>