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  1. PODependencyProperty and WPF Designer
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    <pre><code>class MyLine : Shape { public static readonly DependencyProperty X11Property; public static readonly DependencyProperty X22Property; public static readonly DependencyProperty Y11Property; public static readonly DependencyProperty Y22Property; static MyLine() { X11Property = DependencyProperty.Register("X11", typeof(double), typeof(MyLine), new UIPropertyMetadata(double.NaN)); X22Property = DependencyProperty.Register("X22", typeof(double), typeof(MyLine), new UIPropertyMetadata(double.NaN)); Y11Property = DependencyProperty.Register("Y11", typeof(double), typeof(MyLine), new UIPropertyMetadata(double.NaN)); Y22Property = DependencyProperty.Register("Y22", typeof(double), typeof(MyLine), new UIPropertyMetadata(double.NaN)); } [TypeConverter(typeof(LengthConverter))] public double X11 { get { return (double)GetValue(X11Property); } set { SetValue(X11Property, value); } } [TypeConverter(typeof(LengthConverter))] public double X22 { get { return (double)GetValue(X22Property); } set { SetValue(X22Property, value); } } [TypeConverter(typeof(LengthConverter))] public double Y11 { get { return (double)GetValue(Y11Property); } set { SetValue(Y11Property, value); } } [TypeConverter(typeof(LengthConverter))] public double Y22 { get { return (double)GetValue(Y22Property); } set { SetValue(Y22Property, value); } } protected override System.Windows.Media.Geometry DefiningGeometry { get { var geometryGroup = new GeometryGroup(); // Add line geometryGroup.Children.Add(new LineGeometry(new Point(X11, Y11), new Point(X22, Y22))); return geometryGroup; } } } </code></pre> <p>Why when I update the "myLine" coordinates in WPF designer(VS 2010), it does not update it automatically(live)? </p> <p>When using default "Line" WPF objects, they are automatically updated when the XAML code is changed(edited) in XAML/Design view.</p>
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