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copied!<p>I suggest using a converter to achieve what you want. </p> <p>Your user control's XAML will look like this:</p> <pre><code><UserControl x:Class="MyDateControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:MyDateControl" x:Name="root"> <UserControl.Resources> <my:DatePartConverter x:Key="DatePartConverter" Date="{Binding ElementName=root, Path=Date}"/> </UserControl.Resources> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBox Name="textbox_year" Text="{Binding ElementName=root, Path=Date, Converter={StaticResource DatePartConverter}, ConverterParameter=year, Mode=TwoWay}"/> <TextBox Name="textbox_month" Text="{Binding ElementName=root, Path=Date, Converter={StaticResource DatePartConverter}, ConverterParameter=month, Mode=TwoWay}" /> <TextBox Name="textbox_day" Text="{Binding ElementName=root, Path=Date, Converter={StaticResource DatePartConverter}, ConverterParameter=day, Mode=TwoWay}" /> </StackPanel> </StackPanel> </UserControl> </code></pre> <p>In code-behind you will have only you dependency property:</p> <pre><code>public DateTime Date { get { return (DateTime)GetValue(DateProperty); } set { SetValue(DateProperty, value); } } public static readonly DependencyProperty DateProperty = DependencyProperty.Register("Date", typeof(DateTime), typeof(MyDateControl), new FrameworkPropertyMetadata(DateTime.Now, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); </code></pre> <p>And the converter will look something like this:</p> <pre><code>public class DatePartConverter : Freezable, IValueConverter { public DateTime Date { get { return (DateTime)GetValue(DateProperty); } set { SetValue(DateProperty, value); } } public static readonly DependencyProperty DateProperty = DependencyProperty.Register("Date", typeof(DateTime), typeof(DatePartConverter), new UIPropertyMetadata(DateTime.Now)); public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { DateTime date = (DateTime)value; string datePartType = (string)parameter; string result; switch (datePartType) { case "year": result = date.Year.ToString().PadLeft(4, '0'); break; case "month": result = date.Month.ToString().PadLeft(2, '0'); break; case "day": result = date.Day.ToString().PadLeft(2, '0'); break; default: throw new InvalidOperationException("Unknown date part type (ConverterParameter)"); } return result; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { string datePartValue = (string)value; string datePartType = (string)parameter; DateTime result; switch (datePartType) { case "year": result = new DateTime(int.Parse(datePartValue), Date.Month, Date.Day); break; case "month": result = new DateTime(Date.Year, int.Parse(datePartValue), Date.Day); break; case "day": result = new DateTime(Date.Year, Date.Month, int.Parse(datePartValue)); break; default: throw new InvalidOperationException("Unknown date part type (ConverterParameter)"); } return result; } protected override Freezable CreateInstanceCore() { return new DatePartConverter(); } } </code></pre>

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