When creating a custom control with a GridLength dependency property, Unity crashes.

    public class MyControl : Control

{

public GridLength ContentArea

{

get { return (GridLength)GetValue(ContentAreaProperty); }

set { SetValue(ContentAreaProperty, value); }

}

    public static readonly DependencyProperty ContentAreaProperty = DependencyProperty.Register(
        "ContentArea", typeof(GridLength), typeof(MyControl),
        new PropertyMetadata(new GridLength(0.0f)));
}</pre>