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    <p>The answer provided by @BojinLi works well. After reading through the answer linked to by @GazTheDestroyer however, I decided to implement my own version for the TextBox, because it looked cleaner.</p> <p>To summarize, you can extend the behavior of the TextBox control by using an attached property. (Called ScrollOnTextChanged)</p> <p>Using it is simple:</p> <pre><code>&lt;TextBox src:TextBoxBehaviour.ScrollOnTextChanged="True" VerticalScrollBarVisibility="Auto" /&gt; </code></pre> <p>Here is the TextBoxBehaviour class:</p> <pre><code>using System; using System.Collections.Generic; using System.Windows; using System.Windows.Controls; namespace MyNamespace { public class TextBoxBehaviour { static readonly Dictionary&lt;TextBox, Capture&gt; _associations = new Dictionary&lt;TextBox, Capture&gt;(); public static bool GetScrollOnTextChanged(DependencyObject dependencyObject) { return (bool)dependencyObject.GetValue(ScrollOnTextChangedProperty); } public static void SetScrollOnTextChanged(DependencyObject dependencyObject, bool value) { dependencyObject.SetValue(ScrollOnTextChangedProperty, value); } public static readonly DependencyProperty ScrollOnTextChangedProperty = DependencyProperty.RegisterAttached("ScrollOnTextChanged", typeof (bool), typeof (TextBoxBehaviour), new UIPropertyMetadata(false, OnScrollOnTextChanged)); static void OnScrollOnTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) { var textBox = dependencyObject as TextBox; if (textBox == null) { return; } bool oldValue = (bool) e.OldValue, newValue = (bool) e.NewValue; if (newValue == oldValue) { return; } if (newValue) { textBox.Loaded += TextBoxLoaded; textBox.Unloaded += TextBoxUnloaded; } else { textBox.Loaded -= TextBoxLoaded; textBox.Unloaded -= TextBoxUnloaded; if (_associations.ContainsKey(textBox)) { _associations[textBox].Dispose(); } } } static void TextBoxUnloaded(object sender, RoutedEventArgs routedEventArgs) { var textBox = (TextBox) sender; _associations[textBox].Dispose(); textBox.Unloaded -= TextBoxUnloaded; } static void TextBoxLoaded(object sender, RoutedEventArgs routedEventArgs) { var textBox = (TextBox) sender; textBox.Loaded -= TextBoxLoaded; _associations[textBox] = new Capture(textBox); } class Capture : IDisposable { private TextBox TextBox { get; set; } public Capture(TextBox textBox) { TextBox = textBox; TextBox.TextChanged += OnTextBoxOnTextChanged; } private void OnTextBoxOnTextChanged(object sender, TextChangedEventArgs args) { TextBox.ScrollToEnd(); } public void Dispose() { TextBox.TextChanged -= OnTextBoxOnTextChanged; } } } } </code></pre>
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    1. POHow do I create an Autoscrolling TextBox
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    1. USScott Ferguson
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    1. POHow do I create an Autoscrolling TextBox
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    1. COThis is by far the simplest and easiest answer I have ever found for this question.
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      1. USMoshe Katz
    2. COThis is brilliant, many thanks.
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      1. USChris
    3. COCould you extend your answer to explain what the `_associations` are for and why you have chosen to internally create a disposable object? I *think* I have managed to implement a similar solution with much less code by just registering/unregistering an event handler with the `TextBox` whenever the attached property is set to `true` and `false`, respectively, and it seems to work flawlessly, but this is the first time I've ever written an attached property, so maybe I'm missing something important?
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