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    copied!<p>You may try just not specifying a Width/Height on your UserControl. It should fit to the controls hosted within.</p> <pre><code>&lt;UserControl x:Class="MyUserControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt; &lt;StackPanel&gt; &lt;TextBlock x:Name="TextBlock1" Text="DisplayName Goes Here" /&gt; &lt;local:TimeIntervalControl x:Name="TimeInterval" /&gt; &lt;/StackPanel&gt; &lt;/UserControl&gt; </code></pre> <p>Another option is to use an <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.aspx" rel="nofollow noreferrer">IValueConverter</a> to do some heavier lifting:</p> <pre><code>&lt;UserControl x:Class="MyUserControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt; &lt;UserControl.Resources&gt; &lt;local:MaxValueConverter x:Key="MaxValue" /&gt; &lt;/UserControl.Resources&gt; &lt;UserControl.Width&gt; &lt;MultiBinding Converter="{StaticResource MaxValue}"&gt; &lt;Binding Path="ActualWidth" ElementName="TextBlock1" /&gt; &lt;Binding Path="ActualWidth" ElementName="TimeInterval" /&gt; &lt;/MultiBinding&gt; &lt;/UserControl.Width&gt; &lt;StackPanel&gt; &lt;TextBlock x:Name="TextBlock1" Text="DisplayName Goes Here" /&gt; &lt;local:TimeIntervalControl x:Name="TimeInterval" /&gt; &lt;/StackPanel&gt; &lt;/UserControl&gt; </code></pre> <p>Heavy lifting in your MaxValueConverter:</p> <pre><code>public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (values == null) { return Binding.DoNothing; } return values.Max(obj =&gt; (obj is double) ? (double)obj : 0.0); } </code></pre>
 

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