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    <p>t the end I've decided to implement DelayedBinding as MarkupExtension using composition. </p> <p>The only problem I had was with DataTemplates <code>ProvideValue</code> should return this if <code>TargetProperty</code> from <code>IProvideValueTarget</code> is null.</p> <pre><code>[MarkupExtensionReturnType(typeof(object))] public class DelayedBindingExtension : MarkupExtension { private readonly Binding _binding = new Binding(); public DelayedBindingExtension() { //Default value for delay Delay = TimeSpan.FromSeconds(0.5); } public DelayedBindingExtension(PropertyPath path) : this() { Path = path; } #region properties [DefaultValue(null)] public object AsyncState { get { return _binding.AsyncState; } set { _binding.AsyncState = value; } } [DefaultValue(false)] public bool BindsDirectlyToSource { get { return _binding.BindsDirectlyToSource; } set { _binding.BindsDirectlyToSource = value; } } [DefaultValue(null)] public IValueConverter Converter { get { return _binding.Converter; } set { _binding.Converter = value; } } [TypeConverter(typeof(CultureInfoIetfLanguageTagConverter)), DefaultValue(null)] public CultureInfo ConverterCulture { get { return _binding.ConverterCulture; } set { _binding.ConverterCulture = value; } } [DefaultValue(null)] public object ConverterParameter { get { return _binding.ConverterParameter; } set { _binding.ConverterParameter = value; } } [DefaultValue(null)] public string ElementName { get { return _binding.ElementName; } set { _binding.ElementName = value; } } [DefaultValue(null)] public object FallbackValue { get { return _binding.FallbackValue; } set { _binding.FallbackValue = value; } } [DefaultValue(false)] public bool IsAsync { get { return _binding.IsAsync; } set { _binding.IsAsync = value; } } [DefaultValue(BindingMode.Default)] public BindingMode Mode { get { return _binding.Mode; } set { _binding.Mode = value; } } [DefaultValue(false)] public bool NotifyOnSourceUpdated { get { return _binding.NotifyOnSourceUpdated; } set { _binding.NotifyOnSourceUpdated = value; } } [DefaultValue(false)] public bool NotifyOnTargetUpdated { get { return _binding.NotifyOnTargetUpdated; } set { _binding.NotifyOnTargetUpdated = value; } } [DefaultValue(false)] public bool NotifyOnValidationError { get { return _binding.NotifyOnValidationError; } set { _binding.NotifyOnValidationError = value; } } [DefaultValue(null)] public PropertyPath Path { get { return _binding.Path; } set { _binding.Path = value; } } [DefaultValue(null)] public RelativeSource RelativeSource { get { return _binding.RelativeSource; } set { _binding.RelativeSource = value; } } [DefaultValue(null)] public object Source { get { return _binding.Source; } set { _binding.Source = value; } } [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public UpdateSourceExceptionFilterCallback UpdateSourceExceptionFilter { get { return _binding.UpdateSourceExceptionFilter; } set { _binding.UpdateSourceExceptionFilter = value; } } [DefaultValue(UpdateSourceTrigger.Default)] public UpdateSourceTrigger UpdateSourceTrigger { get { return _binding.UpdateSourceTrigger; } set { _binding.UpdateSourceTrigger = value; } } [DefaultValue(null)] public object TargetNullValue { get { return _binding.TargetNullValue; } set { _binding.TargetNullValue = value; } } [DefaultValue(null)] public string StringFormat { get { return _binding.StringFormat; } set { _binding.StringFormat = value; } } [DefaultValue(false)] public bool ValidatesOnDataErrors { get { return _binding.ValidatesOnDataErrors; } set { _binding.ValidatesOnDataErrors = value; } } [DefaultValue(false)] public bool ValidatesOnExceptions { get { return _binding.ValidatesOnExceptions; } set { _binding.ValidatesOnExceptions = value; } } [DefaultValue(null)] public string XPath { get { return _binding.XPath; } set { _binding.XPath = value; } } [DefaultValue(null)] public Collection&lt;ValidationRule&gt; ValidationRules { get { return _binding.ValidationRules; } } #endregion [DefaultValue(null)] public TimeSpan Delay { get; set; } public override object ProvideValue(IServiceProvider serviceProvider) { try { _binding.Mode = BindingMode.TwoWay; _binding.UpdateSourceTrigger = UpdateSourceTrigger.Explicit; } catch (InvalidOperationException) //Binding in use already don't change it { } var valueProvider = serviceProvider.GetService(typeof (IProvideValueTarget)) as IProvideValueTarget; if (valueProvider != null) { var bindingTarget = valueProvider.TargetObject as DependencyObject; var bindingProperty = valueProvider.TargetProperty as DependencyProperty; if (bindingProperty != null &amp;&amp; bindingTarget != null) { var result = (BindingExpression)_binding.ProvideValue(serviceProvider); new DelayBindingManager(result, bindingTarget, bindingProperty, Delay); return result; } } return this; } private class DelayBindingManager { private readonly BindingExpressionBase _bindingExpression; private readonly DependencyProperty _bindingTargetProperty; private DependencyPropertyDescriptor _descriptor; private readonly DispatcherTimer _timer; public DelayBindingManager(BindingExpressionBase bindingExpression, DependencyObject bindingTarget, DependencyProperty bindingTargetProperty, TimeSpan delay) { _bindingExpression = bindingExpression; _bindingTargetProperty = bindingTargetProperty; _descriptor = DependencyPropertyDescriptor.FromProperty(_bindingTargetProperty, bindingTarget.GetType()); if (_descriptor != null) _descriptor.AddValueChanged(bindingTarget, BindingTargetTargetPropertyChanged); _timer = new DispatcherTimer(); _timer.Tick += TimerTick; _timer.Interval = delay; } private void BindingTargetTargetPropertyChanged(object sender, EventArgs e) { var source = (DependencyObject)sender; if (!BindingOperations.IsDataBound(source, _bindingTargetProperty)) { if (_descriptor != null) { _descriptor.RemoveValueChanged(source, BindingTargetTargetPropertyChanged); _descriptor = null; } return; } _timer.Stop(); _timer.Start(); } private void TimerTick(object sender, EventArgs e) { _timer.Stop(); _bindingExpression.UpdateSource(); } } } </code></pre>
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