using System.Windows; namespace MpvNet.Windows.WPF; public class BindingProxy : Freezable { protected override Freezable CreateInstanceCore() => new BindingProxy(); public object Data { get { return GetValue(DataProperty); } set { SetValue(DataProperty, value); } } // Using a DependencyProperty as the backing store for Data. // This enables animation, styling, binding, etc... public static readonly DependencyProperty DataProperty = DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null)); }