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    <p>I have no idea how @user1089031 done this, but here is working sample for anyone who could be interested in (<strong>updated to @adabyron's comment!</strong>):</p> <p><strong>ViewModel.cs</strong></p> <pre><code>using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Linq; using System.Windows.Data; namespace WpfApplication12 { public class Item { public string Name { get; set; } public override string ToString() { return Name; } } public class ViewModel: INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged = delegate {}; private readonly ObservableCollection&lt;Item&gt; source; private readonly ICollectionView items; private string searchText; public ViewModel() { source = new ObservableCollection&lt;Item&gt; { new Item {Name = "111111111 Test abb - (1)"}, new Item {Name = "22222 Test - (2)"}, new Item {Name = "333 Test - (3)"}, new Item {Name = "44444 Test abc - (4)"}, new Item {Name = "555555 Test cde - (5)"}, new Item {Name = "66 Test - bbcd (6)"}, new Item {Name = "7 Test - cd (7)"}, new Item {Name = "Test - ab (8)"}, }; items = new ListCollectionView(source); } public ICollectionView Items { get { return items; } } public IEnumerable&lt;Item&gt; ItemsSorted { get { return string.IsNullOrEmpty(SearchText) ? source : (IEnumerable&lt;Item&gt;)source .OrderBy(item =&gt; item.Name.IndexOf(SearchText, StringComparison.InvariantCultureIgnoreCase)); } } public Item Selected { get; set; } public string SearchText { get { return searchText; } set { searchText = value; PropertyChanged(this, new PropertyChangedEventArgs("SearchText")); PropertyChanged(this, new PropertyChangedEventArgs("ItemsSorted")); } } } } </code></pre> <p><strong>MainWindow.xaml</strong>:</p> <pre><code>&lt;Window x:Class="WpfApplication12.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit" xmlns:wpfApplication2="clr-namespace:WpfApplication12" xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" Title="MainWindow" Height="200" Width="500" DataContext="{DynamicResource viewModel}"&gt; &lt;Window.Resources&gt; &lt;wpfApplication2:ViewModel x:Key="viewModel" /&gt; &lt;DataTemplate DataType="{x:Type wpfApplication2:Item}"&gt; &lt;TextBlock Text="{Binding Name}" FontFamily="Courier New" /&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition /&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;controls:AutoCompleteBox ItemsSource="{Binding ItemsSorted}" FilterMode="ContainsOrdinal" SelectedItem="{Binding Selected, Mode=TwoWay}" MinimumPrefixLength="0" VerticalAlignment="Top" Margin="5"&gt; &lt;i:Interaction.Behaviors&gt; &lt;wpfApplication2:SearchTextBindBehavior BoundSearchText="{Binding SearchText, Mode=OneWayToSource}" /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/controls:AutoCompleteBox&gt; &lt;ListBox Grid.Column="1" ItemsSource="{Binding Items}" Margin="5" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>As you could notice I've add one custom behavior to <code>AutoCompleteBox</code> control:</p> <pre><code>&lt;i:Interaction.Behaviors&gt; &lt;wpfApplication2:SearchTextBindBehavior BoundSearchText="{Binding SearchText, Mode=OneWayToSource}" /&gt; &lt;/i:Interaction.Behaviors&gt; </code></pre> <p>This is because <code>AutoCompleteBox</code>'s own <code>SearchText</code> property is read-only. So here is the code of this behavior:</p> <p><strong>SearchTextBindBehavior.cs</strong> (<strong>Updated</strong>)</p> <pre><code>using System.Windows; using System.Windows.Controls; using System.Windows.Interactivity; namespace WpfApplication12 { public class SearchTextBindBehavior : Behavior&lt;AutoCompleteBox&gt; { public static readonly DependencyProperty BoundSearchTextProperty = DependencyProperty.Register("BoundSearchText", typeof(string), typeof(SearchTextBindBehavior)); public string BoundSearchText { get { return (string)GetValue(BoundSearchTextProperty); } set { SetValue(BoundSearchTextProperty, value); } } protected override void OnAttached() { base.OnAttached(); AssociatedObject.TextChanged += OnTextChanged; } protected override void OnDetaching() { base.OnDetaching(); AssociatedObject.TextChanged -= OnTextChanged; } private void OnTextChanged(object sender, RoutedEventArgs args) { if(AssociatedObject.Text.Length == 0) { BoundSearchText = string.Empty; return; } if(AssociatedObject.SearchText == AssociatedObject.Text.Substring(0, AssociatedObject.Text.Length - 1)) { BoundSearchText = AssociatedObject.Text; } } } } </code></pre> <p>Note: To make it all work you will need to add reference to the <strong>System.Windows.Interactivity.dll</strong> from the <a href="http://www.microsoft.com/en-us/download/details.aspx?id=10801" rel="nofollow">Expression Blend 4 SDK</a>. This is just where <code>Behavior&lt;T&gt;</code> and a few its friends live.</p> <p>If you have Expression Blend already installed, you already have all the SDK and there is no need to download anything. Just in case - on my machine the assembly located here: </p> <p>C:\Program Files\Microsoft SDKs\Expression\Blend.NETFramework\v4.0\Libraries\System.Windows.Interactivity.dll</p> <p>And, finally, if you have some good reason to do NOT add reference to this popular official library, feel free to re-implemented this custom behavior in "the old way" via plain old attached properties.</p> <p>Hope that helps.</p>
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    1. COWhile this is a nice example, it does not really answer the question, because there is no _dynamic_ sorting involved. I'd like to have items sorted by how early the searchtext appears in them.
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    2. COOh, that is interesting turn, @adabyron. I'll update the answer if I succeed.
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    3. CO@adabyron, please take a look at the updated answer.
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