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    <p>This is what I ended up with, a slight adaptation of Sevenate's answer, so if you wanted to upvote, do that to his post.</p> <p>I used a subclass (I had the <code>AutoCompleteBox</code> subclassed already for other reasons), which allows me to create a wrapper dependency property to get the readonly <code>SearchText</code> (=what the user entered via keyboard) to the ViewModel - instead of a blend behavior, which is a perfectly valid way, too.</p> <p>The crux of the matter is that you should only apply the dynamic sorting upon changes of SearchText, not <code>Text</code> (=what is displayed in the <code>AutoCompleteBox</code>, will also change if a suggestion is selected in the dropdown). Sevenate's way to raise the PropertyChanged event of the readonly ItemsSource (<code>ItemsSorted</code>) is a nice and clean way to apply the sorting.</p> <p>ViewModel:</p> <pre><code>public class Item { public string Name { get; set; } public override string ToString() { return Name; } } public class AutoCompleteBoxDynamicSortingVM : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private readonly ObservableCollection&lt;Item&gt; source; public AutoCompleteBoxDynamicSortingVM() { 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)"}, }; } public IEnumerable&lt;Item&gt; ItemsSorted { get { return string.IsNullOrEmpty(Text) ? (IEnumerable&lt;Item&gt;)source : source.OrderBy(item =&gt; item.Name.IndexOf(Text, StringComparison.OrdinalIgnoreCase)); } } public Item Selected { get; set; } // Text that is shown in AutoCompleteBox private string text; public string Text { get { return text; } set { text = value; OnPropertyChanged("Text"); } } // Text that was entered by user (cannot be changed from viewmodel) private string searchText; public string SearchText { get { return searchText; } set { searchText = value; OnPropertyChanged("SearchText"); OnPropertyChanged("ItemsSorted"); } } private void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } </code></pre> <p>Subclass of AutoCompleteBox:</p> <pre><code>public class MyAutoCompleteBox : AutoCompleteBox { /// &lt;summary&gt; /// Bindable property that encapsulates the readonly property SearchText. /// When the viewmodel tries to set SearchText by way of EnteredText, it will fail without an exception. /// &lt;/summary&gt; public string EnteredText { get { return (string)GetValue(EnteredTextProperty); } set { SetValue(EnteredTextProperty, value); } } public static readonly DependencyProperty EnteredTextProperty = DependencyProperty.Register("EnteredText", typeof(string), typeof(MyAutoCompleteBox), new PropertyMetadata(null)); protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e) { // synchronize SearchText and EnteredText (only one-way) if (e.Property == AutoCompleteBox.SearchTextProperty &amp;&amp; this.EnteredText != this.SearchText) EnteredText = SearchText; base.OnPropertyChanged(e); } } </code></pre> <p>Xaml:</p> <pre><code>&lt;UserControl x:Class="WpfApplication1.Controls.AutoCompleteBoxDynamicSorting" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:myctrls="clr-namespace:WpfApplication1.Controls" xmlns:models="clr-namespace:WpfApplication1.ViewModels" Height="350" Width="525" DataContext="{DynamicResource viewModel}"&gt; &lt;UserControl.Resources&gt; &lt;models:AutoCompleteBoxDynamicSortingVM x:Key="viewModel" /&gt; &lt;DataTemplate DataType="{x:Type models:Item}"&gt; &lt;TextBlock Text="{Binding Path=Name}" /&gt; &lt;/DataTemplate&gt; &lt;/UserControl.Resources&gt; &lt;Grid&gt; &lt;myctrls:MyAutoCompleteBox ItemsSource="{Binding ItemsSorted}" Text="{Binding Text, Mode=TwoWay}" EnteredText="{Binding SearchText, Mode=OneWayToSource}" FilterMode="ContainsOrdinal" VerticalAlignment="Top" Margin="5" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre>
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    1. POWPF AutoCompleteBox dynamic sorting
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    1. USMike Fuchs
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    1. COThis one works great as well, thanks for sharing.
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    2. COActually, I should admit that despite the fact that I'm not a big fun of subclassing from UI elements - it looks like your solution is the only way to go here if we need a clean and simple code without glitches during copy/paste into the AutoCompleteBox field. So it will be fair if your solution will be marked as the answer to this question.
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