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copied!<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><Grid x:Name="LayoutRoot" Background="White"> <Border HorizontalAlignment="Center" VerticalAlignment="Center"> <ComboBox x:Name="WorkCellGroup" ItemsSource="{Binding WorkCellGroupInfoCollection}" SelectedItem="{Binding SelectedWorkCellGroup, Mode=TwoWay}" DisplayMemberPath="Name" /> </Border> </Grid> </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<WorkCellGroupInfo> { } public class ComboBoxSelectedItemTestViewModel : INotifyPropertyChanged { public WorkCellGroupInfoCollection WorkCellGroupInfoCollection { get; set; } public ComboBoxSelectedItemTestViewModel() { WorkCellGroupInfoCollection = new WorkCellGroupInfoCollection(); for (int i = 0; i < 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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