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copied!<p>I have created siple code-only implementation which works fine for WPF and Silverlight as well:</p> <pre><code>using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Media; public class TextBoxWatermarked : TextBox { #region [ Dependency Properties ] public static DependencyProperty WatermarkProperty = DependencyProperty.Register("Watermark", typeof(string), typeof(TextBoxWatermarked), new PropertyMetadata(new PropertyChangedCallback(OnWatermarkChanged))); #endregion #region [ Fields ] private bool _isWatermarked; private Binding _textBinding; #endregion #region [ Properties ] protected new Brush Foreground { get { return base.Foreground; } set { base.Foreground = value; } } public string Watermark { get { return (string)GetValue(WatermarkProperty); } set { SetValue(WatermarkProperty, value); } } #endregion #region [ .ctor ] public TextBoxWatermarked() { Loaded += (s, ea) => ShowWatermark(); } #endregion #region [ Event Handlers ] protected override void OnGotFocus(RoutedEventArgs e) { base.OnGotFocus(e); HideWatermark(); } protected override void OnLostFocus(RoutedEventArgs e) { base.OnLostFocus(e); ShowWatermark(); } private static void OnWatermarkChanged(DependencyObject sender, DependencyPropertyChangedEventArgs ea) { var tbw = sender as TextBoxWatermarked; if (tbw == null) return; tbw.ShowWatermark(); } #endregion #region [ Methods ] private void ShowWatermark() { if (string.IsNullOrEmpty(base.Text)) { _isWatermarked = true; base.Foreground = new SolidColorBrush(Colors.Gray); var bindingExpression = GetBindingExpression(TextProperty); _textBinding = bindingExpression == null ? null : bindingExpression.ParentBinding; if (bindingExpression != null) bindingExpression.UpdateSource(); SetBinding(TextProperty, new Binding()); base.Text = Watermark; } } private void HideWatermark() { if (_isWatermarked) { _isWatermarked = false; ClearValue(ForegroundProperty); base.Text = ""; SetBinding(TextProperty, _textBinding ?? new Binding()); } } #endregion } </code></pre> <p>Usage:</p> <pre><code><TextBoxWatermarked Watermark="Some text" /> </code></pre>

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