using System.Windows; namespace HandyControl.Controls { public class BorderElement { public static readonly DependencyProperty CornerRadiusProperty = DependencyProperty.RegisterAttached( "CornerRadius", typeof(CornerRadius), typeof(BorderElement), new FrameworkPropertyMetadata(default(CornerRadius), FrameworkPropertyMetadataOptions.Inherits)); public static void SetCornerRadius(DependencyObject element, CornerRadius value) => element.SetValue(CornerRadiusProperty, value); public static CornerRadius GetCornerRadius(DependencyObject element) => (CornerRadius)element.GetValue(CornerRadiusProperty); } }