<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:water="http://schemas.xceed.com/wpf/xaml/toolkit"
Title="Window1" Height="300" Width="300" Loaded="Window_Loaded">
<StackPanel >
<ListBox x:Name="listbox" ItemsSource="{Binding}">
</ListBox>
</StackPanel>
</Window>
private void Window_Loaded(object sender, RoutedEventArgs e)
{
List<string> lista = new List<string>();
lista.Add("Item 1");
lista.Add("Item 2");
lista.Add("Item 3");
DataContext = lista;
listbox.SelectedItem = lista.FirstOrDefault();
}
