<UserControl
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Intersoft="http://intersoft.clientui.com/schemas"
    xmlns:local="clr-namespace:ClientUI.Sample"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"      
    mc:Ignorable="d"
        x:Class="ClientUI.Sample" Width="800" Height="600">
        <UserControl.Resources>
                <DataTemplate x:Key="ItemTemplate1">
            <Intersoft:DockPanel FillChildMode="Custom" Width="250">
                                <Image Source="{Binding Picture}" Height="64" Width="64" Intersoft:DockPanel.Dock="Left"/>
                                <Grid Intersoft:DockPanel.IsFillElement="True">
                                        <StackPanel VerticalAlignment="Center" Margin="8">
                                                <TextBlock Text="{Binding ContactName}" />
                                                <TextBlock Text="{Binding EmailAddress}" />                               
                                        </StackPanel>
                                </Grid>
                        </Intersoft:DockPanel>
                </DataTemplate>
        <DataTemplate x:Key="ItemTemplate2">
            <Intersoft:DockPanel FillChildMode="Custom" Width="250">
                <Image Source="{Binding Picture}" Height="64" Width="64" Intersoft:DockPanel.Dock="Right"/>
                <Grid Intersoft:DockPanel.IsFillElement="True">
                    <StackPanel VerticalAlignment="Center" Margin="8">
                        <TextBlock Text="{Binding ContactName}" />
                        <TextBlock Text="{Binding EmailAddress}" />
                    </StackPanel>
                </Grid>
            </Intersoft:DockPanel>
        </DataTemplate>
        <local:AlternateTemplateSelector x:Key="AlternateTemplateSelector" ItemTemplate="{StaticResource ItemTemplate1}" AlternateItemTemplate="{StaticResource ItemTemplate2}"/>
    </UserControl.Resources>
        <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource SampleDataSource}}">
                <Intersoft:UXListBox HorizontalAlignment="Center" VerticalAlignment="Center" 
                                                         ItemTemplateSelector="{StaticResource AlternateTemplateSelector}" ItemsSource="{Binding Collection}"/>
        </Grid>
</UserControl>    

using System.Windows;
using Intersoft.Client.Framework;
using Intersoft.Client.UI.Aqua.UXCollection;

namespace ClientUI.Sample
{
    public class AlternateTemplateSelector: DataTemplateSelector
    {
        public DataTemplate ItemTemplate { get; set; }

        public DataTemplate AlternateItemTemplate { get; set; }

        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            UXListBoxItem control = container as UXListBoxItem;
            if (control != null)
            {
                UXListBox owner = control.Owner as UXListBox;
                if (owner.Items.IndexOf(item) % 2 == 0)
                    return this.ItemTemplate;
            }

            return this.AlternateItemTemplate;
        }
    }
}