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    <p>You need to assign a value to <code>SelectedWorkCellGroup</code> property to do that.</p> <p>In you ViewModel's constructor, write following code:</p> <pre><code>if(WorkCellGroupInfoCollection.Any()) { SelectedWorkCellGroup = WorkCellGroupInfoCollection.First(); } </code></pre> <h2>Edit:</h2> <p>Following works for me:</p> <p>XAML:</p> <pre><code>&lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;Border HorizontalAlignment="Center" VerticalAlignment="Center"&gt; &lt;ComboBox x:Name="WorkCellGroup" ItemsSource="{Binding WorkCellGroupInfoCollection}" SelectedItem="{Binding SelectedWorkCellGroup, Mode=TwoWay}" DisplayMemberPath="Name" /&gt; &lt;/Border&gt; &lt;/Grid&gt; </code></pre> <p>Code Behind:</p> <pre><code>public partial class ComboBoxSelectedItemTest : UserControl { public ComboBoxSelectedItemTest() { InitializeComponent(); DataContext = new ComboBoxSelectedItemTestViewModel(); } } public abstract class FilterBase { public string Id { get; set; } public string Name { get; set; } } public class WorkCellGroupInfo : FilterBase { } public class WorkCellGroupInfoCollection : ObservableCollection&lt;WorkCellGroupInfo&gt; { } public class ComboBoxSelectedItemTestViewModel : INotifyPropertyChanged { public WorkCellGroupInfoCollection WorkCellGroupInfoCollection { get; set; } public ComboBoxSelectedItemTestViewModel() { WorkCellGroupInfoCollection = new WorkCellGroupInfoCollection(); for (int i = 0; i &lt; 25; i++) { WorkCellGroupInfoCollection.Add(new WorkCellGroupInfo() { Id = String.Format("Id #{0}", i + 1), Name = String.Format("Name #{0}", i + 1) }); } SelectedWorkCellGroup = WorkCellGroupInfoCollection.First(); } private WorkCellGroupInfo _selectedWorkCellGroup; public WorkCellGroupInfo SelectedWorkCellGroup { get { return _selectedWorkCellGroup; } set { _selectedWorkCellGroup = value; RaisePropertyChanged("SelectedWorkCellGroup"); } } public event PropertyChangedEventHandler PropertyChanged; protected void RaisePropertyChanged(String propertyName) { PropertyChangedEventHandler temp = PropertyChanged; if (temp != null) { temp(this, new PropertyChangedEventArgs(propertyName)); } } } </code></pre>
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    1. POSelect first item in Silverlight combobox using MVVM pattern
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    1. COThat was fast! Let me try that out and I'll get back to you.
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    2. COI've added that code to the ViewModel's constructor in the ViewModel class but still nothing happens. Can you pelase advise?
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    3. CODo you get any binding errors in Output window? And also you need to put above code after you populate `WorkCellGroupInfoCollection` collection.
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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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