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    <p>You should bind to <a href="http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.actualheight%28v=vs.95%29.aspx" rel="nofollow">ActualHeight</a>, which specifies the height it was arranged at. The Height property allows you to set a fixed height, but doesn't tell you exactly how tall it is when arranged. <hr/> EDIT:</p> <p>Actually, this is a <a href="http://connect.microsoft.com/VisualStudio/feedback/details/522231/silverlight-grid-stackpanel-canvas-actualheight-and-acutalwidth-is-0" rel="nofollow">known bug</a> with Silverlight.</p> <p>You would have to use the SizeChanged event like so:</p> <pre><code>&lt;UserControl x:Class="SilverlightApplication3.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"&gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Button Content="Add Item" Click="Button_Click" /&gt; &lt;ListBox x:Name="listBox1" Grid.Column="0" Grid.Row="1" VerticalAlignment="Top" SizeChanged="listBox1_SizeChanged" /&gt; &lt;ListBox x:Name="listBox2" Grid.Column="1" Grid.Row="1" VerticalAlignment="Top" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>With a code-behind of:</p> <pre><code>using System.Windows; using System.Windows.Controls; namespace SilverlightApplication3 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private int counter; private void Button_Click(object sender, RoutedEventArgs e) { this.counter++; this.listBox1.Items.Add(counter.ToString()); } private void listBox1_SizeChanged(object sender, SizeChangedEventArgs e) { this.listBox2.Height = this.listBox1.ActualHeight; } } } </code></pre> <p>You could probably wrap this up into a nice attached behavior also. <hr/> EDIT: Here is such a behavior:</p> <pre><code>&lt;UserControl x:Class="SilverlightApplication3.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:SilverlightApplication3" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"&gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Button Content="Add Item" Click="Button_Click" /&gt; &lt;ListBox x:Name="listBox1" Grid.Column="0" Grid.Row="1" VerticalAlignment="Top" /&gt; &lt;ListBox x:Name="listBox2" Grid.Column="1" Grid.Row="1" VerticalAlignment="Top" local:SizeSynchronizationBehavior.HeightElement="{Binding ElementName=listBox1}" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>With a code-behind of:</p> <pre><code>using System; using System.Windows; using System.Windows.Controls; namespace SilverlightApplication3 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private int counter; private void Button_Click(object sender, RoutedEventArgs e) { this.counter++; this.listBox1.Items.Add(counter.ToString()); } } public static class SizeSynchronizationBehavior { #region Dependency Properties /////////////////////////////////////////////////////////////////////////////////// // HeightElement /////////////////////////////////////////////////////////////////////////////////// /// &lt;summary&gt; /// Identifies the &lt;c&gt;HeightElement&lt;/c&gt; attached dependency property. This field is read-only. /// &lt;/summary&gt; /// &lt;value&gt;The identifier for the &lt;c&gt;HeightElement&lt;/c&gt; attached dependency property.&lt;/value&gt; public static readonly DependencyProperty HeightElementProperty = DependencyProperty.RegisterAttached("HeightElement", typeof(FrameworkElement), typeof(SizeSynchronizationBehavior), new PropertyMetadata(null, OnHeightElementPropertyValueChanged)); /// &lt;summary&gt; /// Gets the value of the &lt;see cref="HeightElementProperty"/&gt; attached property for the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;The object to which the attached property is retrieved.&lt;/param&gt; /// &lt;returns&gt; /// The value of the &lt;see cref="HeightElementProperty"/&gt; attached property for the the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/returns&gt; public static FrameworkElement GetHeightElement(FrameworkElement obj) { if (obj == null) throw new ArgumentNullException("obj"); return (FrameworkElement)obj.GetValue(HeightElementProperty); } /// &lt;summary&gt; /// Sets the value of the &lt;see cref="HeightElementProperty"/&gt; attached property to the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;The object to which the attached property is written.&lt;/param&gt; /// &lt;param name="value"&gt; /// The new value of the &lt;see cref="HeightElementProperty"/&gt; attached property to the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/param&gt; public static void SetHeightElement(FrameworkElement obj, FrameworkElement value) { if (obj == null) throw new ArgumentNullException("obj"); obj.SetValue(HeightElementProperty, value); } /// &lt;summary&gt; /// Called when &lt;see cref="HeightElementProperty"/&gt; is changed. /// &lt;/summary&gt; /// &lt;param name="d"&gt;The dependency object that was changed.&lt;/param&gt; /// &lt;param name="e"&gt;The &lt;see cref="DependencyPropertyChangedEventArgs"/&gt; instance containing the event data.&lt;/param&gt; private static void OnHeightElementPropertyValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { FrameworkElement element = d as FrameworkElement; if (element == null) return; SizeChangedEventHandler heightSizeChangedEventHandler = GetSizeChangedEventHandler(element); if (heightSizeChangedEventHandler == null) { heightSizeChangedEventHandler = (sender, eventArgs) =&gt; { FrameworkElement he = GetHeightElement(element); if (he != null) element.Height = he.ActualHeight; }; SetSizeChangedEventHandler(element, heightSizeChangedEventHandler); } FrameworkElement heightElement = e.OldValue as FrameworkElement; if (heightElement != null) heightElement.SizeChanged += heightSizeChangedEventHandler; heightElement = e.NewValue as FrameworkElement; if (heightElement != null) heightElement.SizeChanged += heightSizeChangedEventHandler; } /////////////////////////////////////////////////////////////////////////////////// // SizeChangedEventHandler /////////////////////////////////////////////////////////////////////////////////// /// &lt;summary&gt; /// Identifies the &lt;c&gt;SizeChangedEventHandler&lt;/c&gt; attached dependency property. This field is read-only. /// &lt;/summary&gt; /// &lt;value&gt;The identifier for the &lt;c&gt;SizeChangedEventHandler&lt;/c&gt; attached dependency property.&lt;/value&gt; private static readonly DependencyProperty SizeChangedEventHandlerProperty = DependencyProperty.RegisterAttached("SizeChangedEventHandler", typeof(SizeChangedEventHandler), typeof(SizeSynchronizationBehavior), new PropertyMetadata(null)); /// &lt;summary&gt; /// Gets the value of the &lt;see cref="SizeChangedEventHandlerProperty"/&gt; attached property for the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;The object to which the attached property is retrieved.&lt;/param&gt; /// &lt;returns&gt; /// The value of the &lt;see cref="SizeChangedEventHandlerProperty"/&gt; attached property for the the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/returns&gt; private static SizeChangedEventHandler GetSizeChangedEventHandler(FrameworkElement obj) { if (obj == null) throw new ArgumentNullException("obj"); return (SizeChangedEventHandler)obj.GetValue(SizeChangedEventHandlerProperty); } /// &lt;summary&gt; /// Sets the value of the &lt;see cref="SizeChangedEventHandlerProperty"/&gt; attached property to the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;The object to which the attached property is written.&lt;/param&gt; /// &lt;param name="value"&gt; /// The new value of the &lt;see cref="SizeChangedEventHandlerProperty"/&gt; attached property to the specified &lt;see cref="FrameworkElement"/&gt;. /// &lt;/param&gt; private static void SetSizeChangedEventHandler(FrameworkElement obj, SizeChangedEventHandler value) { if (obj == null) throw new ArgumentNullException("obj"); obj.SetValue(SizeChangedEventHandlerProperty, value); } #endregion // Dependency Properties } } </code></pre>
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    1. COThis is not working in my POC. Also, ActualHeight returns the vertical height of the screen in full mode according to MS docs.
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    2. CO@Nissan - Are you looking at the ListBox.ActualHeight?
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    3. COYes. If you bind to this the height does not change for the Auto-height listbox.
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