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    copied!<p>I suggest you do the following in your Presenter:</p> <p>=> Create a ListCollectionView field. Set it to be equal to the "Default Collection View" of your collection, and use it as the ItemsSource for the list control. Something like:</p> <pre><code> public class Presenter() { private ListCollectionView lcv; public Presenter() { this.lcv = (ListCollectionView)CollectionViewSource.GetDefaultView(animalsCollection); listControl.ItemsSource = this.lcv; } } </code></pre> <p>=> In the handler/logic for the RadioButton's corresponding event, filter the ListCollectionView. Something like:</p> <p><pre><code> void OnCheckedChanged() { bool showMammals = radioButton.IsChecked; this.lcv.Filter = new Predicate((p) => (p as Animal).IsMammal == showMammals); this.lcv.Refresh(); } </pre></code></p> <p>Hope this helps.</p> <p><strong>EDIT:</strong></p> <p>While doing this is possible using MVP, using MVVM should be a better choice, IMHO (and as mentioned by the other answer). To help you out, I wrote a sample that implements your requirements via MVVM. See below:</p> <p>XAML:</p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.DataContext&gt; &lt;local:ViewModel/&gt; &lt;/Window.DataContext&gt; &lt;Grid&gt; &lt;StackPanel Orientation="Vertical"&gt; &lt;RadioButton x:Name="rb1" GroupName="MyGroup" Content="IsMammal = true" Checked="rb1_Checked"/&gt; &lt;RadioButton x:Name="rb2" GroupName="MyGroup" Content="IsMammal = false" Checked="rb2_Checked"/&gt; &lt;ListBox ItemsSource="{Binding Path=AnimalsCollectionView}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Path=Name}"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>Code-behind:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Collections.ObjectModel; using System.Threading; using System.ComponentModel; namespace WpfApplication1 { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void rb1_Checked(object sender, RoutedEventArgs e) { (this.DataContext as ViewModel).UpdateFilter(true); } private void rb2_Checked(object sender, RoutedEventArgs e) { (this.DataContext as ViewModel).UpdateFilter(false); } } public class ViewModel : INotifyPropertyChanged { private ObservableCollection&lt;Animal&gt; animals = new ObservableCollection&lt;Animal&gt;(); private ListCollectionView animalsCollectionView; public ListCollectionView AnimalsCollectionView { get { return this.animalsCollectionView; } } public void UpdateFilter(bool showMammals) { this.animalsCollectionView.Filter = new Predicate&lt;object&gt;((p) =&gt; (p as Animal).IsMammal == showMammals); this.animalsCollectionView.Refresh(); } public ViewModel() { this.animals.Add(new Animal() { Name = "Dog", IsMammal = true }); this.animals.Add(new Animal() { Name = "Cat", IsMammal = true }); this.animals.Add(new Animal() { Name = "Bird", IsMammal = false }); this.animalsCollectionView = (ListCollectionView)CollectionViewSource.GetDefaultView(this.animals); } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(string propName) { if (this.PropertyChanged != null) { this.PropertyChanged(this, new PropertyChangedEventArgs(propName)); } } #endregion } public class Animal : INotifyPropertyChanged { private string name; public string Name { get { return this.name; } set { this.name = value; this.OnPropertyChanged("Name"); } } private bool isMammal; public bool IsMammal { get { return this.isMammal; } set { this.isMammal = value; this.OnPropertyChanged("IsMammal"); } } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(string propName) { if (this.PropertyChanged != null) { this.PropertyChanged(this, new PropertyChangedEventArgs(propName)); } } #endregion } } </code></pre>
 

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