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copied!<p><em>If</em> you can use <code>Interactions</code> with <code>FluidLayout</code> (<a href="http://www.microsoft.com/download/en/details.aspx?id=10801" rel="nofollow">Blend 4 SDK</a>) you are in luck, it's really useful for those fancy animation things.</p> <p>First set the content CP's Height to 0:</p> <pre><code><ContentPresenter Grid.Row="1" HorizontalAlignment="Stretch" x:Name="_expanderContent" Height="0"/> </code></pre> <p>To animate this, the <code>Height</code> just needs to be animated to <code>NaN</code> in the <code>VisualState</code> that represents the expanded state (non-discrete animations would not let you use <code>NaN</code>):</p> <pre><code>xmlns:is="http://schemas.microsoft.com/expression/2010/interactions" </code></pre> <pre><code><Grid x:Name="MainGrid" Background="White"> <VisualStateManager.CustomVisualStateManager> <is:ExtendedVisualStateManager/> </VisualStateManager.CustomVisualStateManager> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="ExpansionStates" is:ExtendedVisualStateManager.UseFluidLayout="True"> <VisualStateGroup.Transitions> <VisualTransition GeneratedDuration="0:0:1"/> </VisualStateGroup.Transitions> <VisualState x:Name="Expanded"> <Storyboard> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Height)" Storyboard.TargetName="_expanderContent"> <DiscreteDoubleKeyFrame KeyTime="0" Value="NaN"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Collapsed"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups>  </code></pre> <p>That should be all that is necessary, the fluid layout will create the transition for you from there.</p> <hr> <p>If you have a code-behind solution that would be fine, you can even use code-behind in dictionaries like this:</p> <pre><code> <ResourceDictionary x:Class="Test.TestDictionary" ...> </code></pre> <pre><code>//TestDictionary.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; namespace Test { partial class TestDictionary : ResourceDictionary { //Handlers and such here } } </code></pre>

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