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    <p>Unfortunately the <em>IValueConverter</em> approach will not always work; if the children are added to <em>StackPanel</em> statically, for example, the child collection will be empty at the time of binding (so I discovered). The simplest solution is to create a custom panel:</p> <pre><code>public class ConstrainedStackPanel : StackPanel { public ConstrainedStackPanel() { } protected override Size MeasureOverride(Size constraint) { foreach (var item in this.Children) { // FrameworkElement has the Width property we care about. FrameworkElement element = item as FrameworkElement; if (element != null) constraint.Width = Math.Min(element.Width, constraint.Width); } return base.MeasureOverride(constraint); } protected override Size ArrangeOverride(Size arrangeSize) { foreach (var item in this.Children) { // FrameworkElement has the Width property we care about. FrameworkElement element = item as FrameworkElement; if (element != null) arrangeSize.Width = Math.Min(element.Width, arrangeSize.Width); } return base.ArrangeOverride(arrangeSize); } } </code></pre> <p>You can use the panel as illustrated by the following XAML:</p> <pre><code>&lt;StackPanel Margin="5"&gt; &lt;TextBlock Text="StackPanel:" FontWeight="Bold" /&gt; &lt;StackPanel x:Name="panelA"&gt; &lt;Button Width="100" Content="100" /&gt; &lt;Button Width="200" Content="200" /&gt; &lt;Button Width="300" Content="300" /&gt; &lt;Button Width="400" Content="400" /&gt; &lt;/StackPanel&gt; &lt;TextBlock Text="ConstrainedStackPanel:" FontWeight="Bold" Margin="0,10,0,0" /&gt; &lt;l:ConstrainedStackPanel x:Name="panelB"&gt; &lt;Button Width="100" Content="100" /&gt; &lt;Button Width="200" Content="200" /&gt; &lt;Button Width="300" Content="300" /&gt; &lt;Button Width="400" Content="400" /&gt; &lt;/l:ConstrainedStackPanel&gt; &lt;/StackPanel&gt; </code></pre> <p>Which will render something like the following:</p> <h2><img src="https://farm4.static.flickr.com/3133/3118591068_b1edcce6c0_m.jpg" alt="ScreenShot"></h2> <p>I hope this helps.</p>
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