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    copied!<p>Although I suspect there may be a better way to solve your problem, I think I have an answer for what you want to do. ( You didn't mention what type your container is. A StackPanel for instance takes care of the width calculation for you. See TextBox#2 below)</p> <p>First the XAML</p> <pre><code>&lt;Window x:Class="WpfApplication1.Window2" ... xmlns:local="clr-namespace:WpfApplication1" Title="Window2" Height="300" Width="300"&gt; &lt;Window.Resources&gt; &lt;local:WidthSansMarginConverter x:Key="widthConverter" /&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;StackPanel x:Name="stack"&gt; &lt;TextBlock x:Name="txtStatusMessages" Width="{Binding ElementName=stack,Path=ActualWidth, Converter={StaticResource widthConverter}}" TextWrapping="WrapWithOverflow" Background="Aquamarine" Margin="5,5,5,5"&gt; This is a message &lt;/TextBlock&gt; &lt;TextBlock x:Name="txtWhatsWrongWithThis" TextWrapping="WrapWithOverflow" Background="Aquamarine" Margin="5,5,5,5"&gt; This is another message &lt;/TextBlock&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>Next the Converter. We have a problem here.. since <a href="http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/7298ceb5-bf56-47aa-a161-5dd99189408b/" rel="nofollow noreferrer">the ConverterParameter for the Convert methods cannot be a dynamic value</a> for some reason. So we sneak in the Textbox Margin via a public property of the Converter that we set in Window's ctor. <strong>WidthSansMarginConverter.cs</strong> </p> <pre><code>public class WidthSansMarginConverter : IValueConverter { private Thickness m_Margin = new Thickness(0.0); public Thickness Margin { get { return m_Margin; } set { m_Margin = value; } } #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (targetType != typeof(double)) { return null; } double dParentWidth = Double.Parse(value.ToString()); double dAdjustedWidth = dParentWidth-m_Margin.Left-m_Margin.Right; return (dAdjustedWidth &lt; 0 ? 0 : dAdjustedWidth); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } </code></pre> <p>Window2.xaml.cs</p> <pre><code> public Window2() { InitializeComponent(); WidthSansMarginConverter obConverter = this.FindResource("widthConverter") as WidthSansMarginConverter; obConverter.Margin = txtStatusMessages.Margin; } </code></pre> <p>HTH. Thanks for the exercise :)</p>
 

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