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    <p>There's a couple of solutions for this. Perhaps the easiest would be to implement a custom Behavior (you'll need to reference System.Windows.Interactivity.dll) &amp; hook onto some events TextBox exposes, like GotFocus and LostFocus. Here's a sample I've done for selecting all of a TextBox's text when it gets focused:</p> <pre><code>using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Interactivity; namespace TextBoxUtility { public class TextBoxSelectAllOnFocusBehavior : Behavior&lt;TextBox&gt; { protected override void OnAttached() { base.OnAttached(); this.AssociatedObject.PreviewMouseLeftButtonDown += OnPreviewMouseLeftButtonDown; this.AssociatedObject.GotKeyboardFocus += OnSelectAll; this.AssociatedObject.MouseDoubleClick += OnSelectAll; } protected override void OnDetaching() { this.AssociatedObject.PreviewMouseLeftButtonDown -= OnPreviewMouseLeftButtonDown; this.AssociatedObject.GotKeyboardFocus -= OnSelectAll; this.AssociatedObject.MouseDoubleClick -= OnSelectAll; base.OnDetaching(); } private static void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { var textbox = sender as TextBox; if (textbox != null &amp;&amp; !textbox.IsKeyboardFocusWithin) { textbox.Focus(); e.Handled = true; } } private static void OnSelectAll(object sender, RoutedEventArgs e) { var textbox = sender as TextBox; if (textbox != null) { textbox.SelectAll(); } } </code></pre> <p>Edit: Forgot to show how to hook the behavior up to the TextBox. To attach the Behavior, in your XAML you'll need to add a namespace reference to your Behavior's namespace, and then attach it as a child of the TextBox markup like so:</p> <pre><code>&lt;TextBox Text="{Binding ....}"&gt; &lt;i:Interaction.Behaviors&gt; &lt;utility:TextBoxSelectAllOnFocusBehavior /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/TextBox&gt; </code></pre> <p>You could do something similar, though with yours you'd want to hook up to the LostFocus-related events and adjust the contents of the TextBox's Text property.</p>
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    1. POHow to 'format' text box values in WPF
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    1. COHow do you attach or detach the event ? Will it do it on all textbox by default???
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    2. COWhoops, sorry, forgot to show that. I've updated the answer now to include that markup.
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