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copied!<p>Here's a sample (type something into the textbox and watch the adorner):</p> <p>Code:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Globalization; namespace Adorners { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); this.Loaded += (o, e) => { AdornerLayer layer = AdornerLayer.GetAdornerLayer(this.t); MyAdorner myAdorner = new MyAdorner(this.t); layer.Add(myAdorner); this.t.Text = "Modified Value"; }; } } public class MyAdorner : Adorner { public static DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(MyAdorner), new PropertyMetadata("Default Text", (o, e) => { ((MyAdorner)o).InvalidateVisual(); })); // Be sure to call the base class constructor. public MyAdorner(UIElement adornedElement) : base(adornedElement) { this.DataContext = this.AdornedElement; this.SetUpBindings(); } private void SetUpBindings() { BindingOperations.SetBinding(this, MyAdorner.TextProperty, new Binding() { Path = new PropertyPath("Text"), UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged }); } public string Text { get { return (string)this.GetValue(MyAdorner.TextProperty); } set { this.SetValue(MyAdorner.TextProperty, value); } } protected override void OnRender(DrawingContext drawingContext) { Rect adornedElementRect = new Rect(this.AdornedElement.DesiredSize); drawingContext.DrawText(new FormattedText(this.Text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("Arial"), 20, Brushes.Black), new Point(0, 150)); } } } </code></pre> <p>Markup:</p> <pre><code><Window x:Class="Adorners.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid x:Name="AdornedGrid"> <TextBox x:Name="t" Width="200" Height="100" Background="Green"></TextBox> </Grid> </Window> </code></pre>

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