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copied!<p>For your DatePicker dilemma, I found a neat hack using attached properties (modified from my use of CommandBindings):</p> <pre><code>class AttachedProperties : DependencyObject { #region RegisterBlackoutDates // Adds a collection of command bindings to a date picker's existing BlackoutDates collection, since the collections are immutable and can't be bound to otherwise. // // Usage: <DatePicker hacks:AttachedProperties.RegisterBlackoutDates="{Binding BlackoutDates}" > public static DependencyProperty RegisterBlackoutDatesProperty = DependencyProperty.RegisterAttached("RegisterBlackoutDates", typeof(System.Windows.Controls.CalendarBlackoutDatesCollection), typeof(AttachedProperties), new PropertyMetadata(null, OnRegisterCommandBindingChanged)); public static void SetRegisterBlackoutDates(UIElement element, System.Windows.Controls.CalendarBlackoutDatesCollection value) { if (element != null) element.SetValue(RegisterBlackoutDatesProperty, value); } public static System.Windows.Controls.CalendarBlackoutDatesCollection GetRegisterBlackoutDates(UIElement element) { return (element != null ? (System.Windows.Controls.CalendarBlackoutDatesCollection)element.GetValue(RegisterBlackoutDatesProperty) : null); } private static void OnRegisterCommandBindingChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { System.Windows.Controls.DatePicker element = sender as System.Windows.Controls.DatePicker; if (element != null) { System.Windows.Controls.CalendarBlackoutDatesCollection bindings = e.NewValue as System.Windows.Controls.CalendarBlackoutDatesCollection; if (bindings != null) { element.BlackoutDates.Clear(); foreach (var dateRange in bindings) { element.BlackoutDates.Add(dateRange); } } } } #endregion } </code></pre> <p>I'm sure I'm too late to help you out, but hopefully someone else will find it useful.</p>

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