simplifies creation of DependencyProperties (XAML)

PropertyUtils.cs

public static class PropertyUtils
{
    public static DependencyProperty CreateProperty<TProperty, TOwner> (string propertyName, Action<TOwner, TProperty, TProperty> onChange, TProperty defaultValue=default(TProperty)) where TOwner : class
    {
        return DependencyProperty.Register(propertyName, typeof (TProperty), typeof (TOwner),
            new PropertyMetadata(defaultValue, (o, args) =>
            {
                onChange(o as TOwner, (TProperty)args.OldValue, (TProperty)args.NewValue);
            }));
    }
}