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    <p>The DataContext of a DataTemplate is set to the object that it is bound to. So in your case the DataContext for your Templates are <code>Product_Type</code> and you are expecting it to be <code>MyViewModel</code>. </p> <p>There is a workaround for what you need. It uses a <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.binding.relativesource%28v=vs.110%29.aspx" rel="nofollow"><code>RelativeSource</code></a> binding and <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.relativesourcemode%28v=vs.110%29.aspx" rel="nofollow"><code>FindAncester</code></a> to access the DataContext of the Parent object.</p> <p>Your DataTemplate bindings should look like this:</p> <p><strong>XAML</strong></p> <pre><code> &lt;DataTemplate x:Key="T1"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="40" /&gt; &lt;RowDefinition Height="40" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="120" /&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Grid.Row="0" Text="Music" Style="{StaticResource ResourceKey=textBlockStyle}" /&gt; &lt;TextBox Grid.Column="1" Grid.Row="0" Style="{StaticResource ResourceKey=textBoxStyle}" Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentControl}}, Path=DataContext.MusicName}" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="T2"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="40" /&gt; &lt;RowDefinition Height="40" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="120" /&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Grid.Row="0" Text="Currency" Style="{StaticResource ResourceKey=textBlockStyle}" /&gt; &lt;ComboBox Grid.Column="1" Grid.Row="0" Style="{StaticResource ResourceKey=comboBoxStyle}" ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentControl}}, Path=DataContext.Currency_List}" SelectedItem="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentControl}}, Path=DataContext.Currency}" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; </code></pre> <p><strong>From MSDN</strong> </p> <blockquote> <p><em>Find Ancestor</em> - Refers to the ancestor in the parent chain of the data-bound element. You can use this to bind to an ancestor of a specific type or its subclasses.</p> </blockquote> <p>The <code>AncestorType</code> attribute goes up the visual tree and finds the first Ancestor of the given type, in this case it's looking for <code>ContentControl</code> the path to the required property can then be set relative to this. </p> <p><strong>Update</strong></p> <p>Think of a template as a guide on how to display an object. The DataContext of the DataTemplate is going to be whatever object it is asked it to display. </p> <p>In this case the ContentControl is told to display <code>Product_Type</code> and, depending on the value of <code>Product_Type</code>, to use a particular Template. <code>Product_Type</code> is given to the DataTemplate and becomes the DataContext.</p> <p><a href="http://wpftutorial.net/DataTemplates.html" rel="nofollow">WPFTutorials</a> has some good examples. </p>
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    1. COThanks, nmaait! However, could you help me understand, why is the DataContext on my DataTemplate Product_Type? I thought Content on ContentControl was just fed into the "item" parameter of the SelectTemplate method on the ContentTemplateSelector. If I am wrong, then what should be fed into SelectTemplate?
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    2. COBtw, I just edited my question to add my DataTemplateSelector.
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    3. COSee my update. Hopefully it is a little clearer.
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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.

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