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    <p>The accepted answer is wrong as explained in the comments. I wrote the following behavior which achieves the desired functionality:</p> <pre><code>public class PersistGroupExpandedStateBehavior : Behavior&lt;Expander&gt; { #region Static Fields public static readonly DependencyProperty GroupNameProperty = DependencyProperty.Register( "GroupName", typeof(object), typeof(PersistGroupExpandedStateBehavior), new PropertyMetadata(default(object))); private static readonly DependencyProperty ExpandedStateStoreProperty = DependencyProperty.RegisterAttached( "ExpandedStateStore", typeof(IDictionary&lt;object, bool&gt;), typeof(PersistGroupExpandedStateBehavior), new PropertyMetadata(default(IDictionary&lt;object, bool&gt;))); #endregion #region Public Properties public object GroupName { get { return (object)this.GetValue(GroupNameProperty); } set { this.SetValue(GroupNameProperty, value); } } #endregion #region Methods protected override void OnAttached() { base.OnAttached(); bool? expanded = this.GetExpandedState(); if (expanded != null) { this.AssociatedObject.IsExpanded = expanded.Value; } this.AssociatedObject.Expanded += this.OnExpanded; this.AssociatedObject.Collapsed += this.OnCollapsed; } protected override void OnDetaching() { this.AssociatedObject.Expanded -= this.OnExpanded; this.AssociatedObject.Collapsed -= this.OnCollapsed; base.OnDetaching(); } private ItemsControl FindItemsControl() { DependencyObject current = this.AssociatedObject; while (current != null &amp;&amp; !(current is ItemsControl)) { current = VisualTreeHelper.GetParent(current); } if (current == null) { return null; } return current as ItemsControl; } private bool? GetExpandedState() { var dict = this.GetExpandedStateStore(); if (!dict.ContainsKey(this.GroupName)) { return null; } return dict[this.GroupName]; } private IDictionary&lt;object, bool&gt; GetExpandedStateStore() { ItemsControl itemsControl = this.FindItemsControl(); if (itemsControl == null) { throw new Exception( "Behavior needs to be attached to an Expander that is contained inside an ItemsControl"); } var dict = (IDictionary&lt;object, bool&gt;)itemsControl.GetValue(ExpandedStateStoreProperty); if (dict == null) { dict = new Dictionary&lt;object, bool&gt;(); itemsControl.SetValue(ExpandedStateStoreProperty, dict); } return dict; } private void OnCollapsed(object sender, RoutedEventArgs e) { this.SetExpanded(false); } private void OnExpanded(object sender, RoutedEventArgs e) { this.SetExpanded(true); } private void SetExpanded(bool expanded) { var dict = this.GetExpandedStateStore(); dict[this.GroupName] = expanded; } #endregion } </code></pre> <p>It attaches a dictionary to the containing <code>ItemsControl</code> which saves the expanded state for every group item. This will be peristent, even if the items in the control changes.</p> <p><strong>Usage:</strong></p> <pre><code>&lt;Expander&gt; &lt;i:Interaction.Behaviors&gt; &lt;behaviors:PersistGroupExpandedStateBehavior GroupName="{Binding Name}" /&gt; &lt;/i:Interaction.Behaviors&gt; ... &lt;/Expander&gt; </code></pre>
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