Prototype Property (GoToolCreating)
Gets or sets the GoObject that should be copied, sized, and positioned
by this tool.
public virtual GoObject Prototype {get; set;}
Property Value
By default this is just a GoRectangle, but it is normally set to
the kind of object, initialized the way you want, that you want the
user to draw. The object should be Resizable and ResizesRealtime,
and probably should be Reshapable.