The Figures property uses PathFigureCollection to store PathFigure information.
PathFigureCollection defines no methods or properties beyond the basic Collection methods and properties. Methods such as Add or GetItem will expect or return objects that are of type PathFigure.
The XAML syntax for properties that use a PathFigureCollection is an example of implicit collection syntax, in which you can omit an actual PathFigureCollection object element, as well as the <PathGeometry.Figures> property element. Explicitly including a PathFigureCollection object element is permissible XAML syntax and might be useful if you intend to name the collection in XAML and manipulate its contents through script later.