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copied!<p>Hmm this seemed like an interesting thing to implement so I took a crack at it. From some goggling it doesn't seem like there is a straight forward way to "tell" the Textbox to scroll itself to the end. So I thought of it a different way. All framework controls in WPF have a default Style/ControlTemplate, and judging by the looks of the Textbox control there must be a ScrollViewer inside which handles the scrolling. So, why not just work with a local copy of the default Textbox ControlTemplate and programmaticlly get the ScrollViewer. I can then tell the ScrollViewer to scroll its Contents to the end. Turns out this idea works.</p> <p>Here is the test program I wrote, could use some refactoring but you can get the idea by looking at it:</p> <p>Here is the XAML:</p> <pre><code><Window x:Class="WpfApplication3.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfApplication3="clr-namespace:WpfApplication3" Title="MainWindow" Height="350" Width="525"> <Window.Resources>  <SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" /> <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" /> <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFF" /> <SolidColorBrush x:Key="SolidBorderBrush" Color="#888" /> <ControlTemplate x:Key="MyTextBoxTemplate" TargetType="{x:Type TextBoxBase}"> <Border x:Name="Border" CornerRadius="2" Padding="2" Background="{StaticResource WindowBackgroundBrush}" BorderBrush="{StaticResource SolidBorderBrush}" BorderThickness="1"> <ScrollViewer Margin="0" x:Name="PART_ContentHost" /> </Border> <ControlTemplate.Triggers> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" /> <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBackgroundBrush}" /> <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> <Style x:Key="MyTextBox" TargetType="{x:Type TextBoxBase}"> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="OverridesDefaultStyle" Value="True" /> <Setter Property="KeyboardNavigation.TabNavigation" Value="None" /> <Setter Property="FocusVisualStyle" Value="{x:Null}" /> <Setter Property="MinWidth" Value="120" /> <Setter Property="MinHeight" Value="20" /> <Setter Property="AllowDrop" Value="true" /> <Setter Property="Template" Value="{StaticResource MyTextBoxTemplate}"></Setter> </Style> </Window.Resources> <Grid> <WpfApplication3:AutoScrollTextBox x:Name="textbox" TextWrapping="Wrap" Style="{StaticResource MyTextBox}" VerticalScrollBarVisibility="Visible" AcceptsReturn="True" Width="100" Height="100">test</WpfApplication3:AutoScrollTextBox> </Grid> </Window> </code></pre> <p>And the code behind:</p> <pre><code>using System; using System.Windows; using System.Windows.Controls; namespace WpfApplication3 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); for (int i = 0; i < 10; i++) { textbox.AppendText("Line " + i + Environment.NewLine); } } } public class AutoScrollTextBox : TextBox { protected override void OnTextChanged(TextChangedEventArgs e) { base.OnTextChanged(e); // Make sure the Template is in the Visual Tree: // http://stackoverflow.com/questions/2285491/wpf-findname-returns-null-when-it-should-not ApplyTemplate(); var template = (ControlTemplate) FindResource("MyTextBoxTemplate"); var scrollViewer = template.FindName("PART_ContentHost", this) as ScrollViewer; //SelectionStart = Text.Length; scrollViewer.ScrollToEnd(); } } } </code></pre>

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