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    <p>I built upon the <code>AnimationHelper</code> class provided by Nigel Shaw and wrapped it in a reusable <code>GridAnimationBehavior</code> which can be attached to the <code>RowDefinition</code> and <code>ColumnDefinition</code> elements.</p> <pre><code>/// &lt;summary&gt; /// Wraps the functionality provided by the &lt;see cref="AnimationHelper"/&gt; class /// in a behavior which can be used with the &lt;see cref="ColumnDefinition"/&gt; /// and &lt;see cref="RowDefinition"/&gt; types. /// &lt;/summary&gt; public class GridAnimationBehavior : DependencyObject { #region Attached IsExpanded DependencyProperty /// &lt;summary&gt; /// Register the "IsExpanded" attached property and the "OnIsExpanded" callback /// &lt;/summary&gt; public static readonly DependencyProperty IsExpandedProperty = DependencyProperty.RegisterAttached("IsExpanded", typeof(bool), typeof(GridAnimationBehavior), new FrameworkPropertyMetadata(OnIsExpandedChanged)); public static void SetIsExpanded(DependencyObject dependencyObject, bool value) { dependencyObject.SetValue(IsExpandedProperty, value); } #endregion #region Attached Duration DependencyProperty /// &lt;summary&gt; /// Register the "Duration" attached property /// &lt;/summary&gt; public static readonly DependencyProperty DurationProperty = DependencyProperty.RegisterAttached("Duration", typeof(TimeSpan), typeof(GridAnimationBehavior), new FrameworkPropertyMetadata(TimeSpan.FromMilliseconds(200))); public static void SetDuration(DependencyObject dependencyObject, TimeSpan value) { dependencyObject.SetValue(DurationProperty, value); } private static TimeSpan GetDuration(DependencyObject dependencyObject) { return (TimeSpan)dependencyObject.GetValue(DurationProperty); } #endregion #region GridCellSize DependencyProperty /// &lt;summary&gt; /// Use a private "GridCellSize" dependency property as a temporary backing /// store for the last expanded grid cell size (row height or column width). /// &lt;/summary&gt; private static readonly DependencyProperty GridCellSizeProperty = DependencyProperty.Register("GridCellSize", typeof(double), typeof(GridAnimationBehavior), new UIPropertyMetadata(0.0)); private static void SetGridCellSize(DependencyObject dependencyObject, double value) { dependencyObject.SetValue(GridCellSizeProperty, value); } private static double GetGridCellSize(DependencyObject dependencyObject) { return (double)dependencyObject.GetValue(GridCellSizeProperty); } #endregion /// &lt;summary&gt; /// Called when the attached &lt;c&gt;IsExpanded&lt;/c&gt; property changed. /// &lt;/summary&gt; private static void OnIsExpandedChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var duration = GetDuration(dependencyObject); var rowDefinition = dependencyObject as RowDefinition; if (rowDefinition != null) { // The IsExpanded attached property of a RowDefinition changed if ((bool)e.NewValue) { var expandedHeight = GetGridCellSize(rowDefinition); if (expandedHeight &gt; 0) { // Animate row height back to saved expanded height. AnimationHelper.AnimateGridRowExpandCollapse(rowDefinition, true, expandedHeight, rowDefinition.ActualHeight, 0, duration); } } else { // Save expanded height and animate row height down to zero. SetGridCellSize(rowDefinition, rowDefinition.ActualHeight); AnimationHelper.AnimateGridRowExpandCollapse(rowDefinition, false, rowDefinition.ActualHeight, 0, 0, duration); } } var columnDefinition = dependencyObject as ColumnDefinition; if (columnDefinition != null) { // The IsExpanded attached property of a ColumnDefinition changed if ((bool)e.NewValue) { var expandedWidth = GetGridCellSize(columnDefinition); if (expandedWidth &gt; 0) { // Animate column width back to saved expanded width. AnimationHelper.AnimateGridColumnExpandCollapse(columnDefinition, true, expandedWidth, columnDefinition.ActualWidth, 0, duration); } } else { // Save expanded width and animate column width down to zero. SetGridCellSize(columnDefinition, columnDefinition.ActualWidth); AnimationHelper.AnimateGridColumnExpandCollapse(columnDefinition, false, columnDefinition.ActualWidth, 0, 0, duration); } } } } </code></pre> <p>Note that I tweaked Nigel's code a bit to use a parameter of type TimeSpan for the animation duration instead of separate seconds and milliseconds parameters.</p> <p>This behavior makes the animation of grid rows/columns MVVM friendly (XAML-only, no code behind required). Example:</p> <pre><code>&lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*" Behaviors:GridAnimationBehavior.IsExpanded="{Binding IsUpperPaneVisible}" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;RowDefinition Height="*" Behaviors:GridAnimationBehavior.IsExpanded="{Binding IsLowerPaneVisible}" /&gt; &lt;/Grid.RowDefinitions&gt; </code></pre> <p>I added this answer because the original poster asked for a pure XAML solution.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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