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    <p>Create a converter that implements IMultiValueConverter. It might look something like this:</p> <pre><code>class AverageConverter : IMultiValueConverter { #region IMultiValueConverter Members public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { int total = 0; int number = 0; foreach (object o in values) { int i; bool parsed = int.TryParse(o.ToString(), out i); if (parsed) { total += i; number++; } } if (number == 0) return 0; return (total/number).ToString(); } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } </code></pre> <p>A multivalue converter receives an object array, one for each of the bindings. You can process these however you need, depending on whether you're intending it for double or int or whatever.</p> <p>If the two textboxes are databound, you can use the same bindings in the multibinding for your textblock (remembering to notify when the property changes so that your average is updated), or you can get the text value by referring to the textboxes by ElementName.</p> <pre><code>&lt;TextBox Text="{Binding Value1}" x:Name="TextBox1" /&gt; &lt;TextBox Text="{Binding Value2}" x:Name="TextBox2" /&gt; &lt;TextBlock&gt; &lt;TextBlock.Text&gt; &lt;MultiBinding Converter="{StaticResource AverageConverter}"&gt; &lt;Binding ElementName="TextBox1" Path="Text" /&gt; &lt;Binding ElementName="TextBox2" Path="Text" /&gt; &lt;!-- OR --&gt; &lt;!-- &lt;Binding Path="Value1" /&gt; --&gt; &lt;!-- &lt;Binding Path="Value2" /&gt; --&gt; &lt;/MultiBinding&gt; &lt;/TextBlock.Text&gt; &lt;/TextBlock&gt; </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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