I understand that in order to set the Geometry i need to :  

RadDiagramShape shapeCloud = new RadDiagramShape()
    {
        Width = 180,
        Height = 100,
        Position = new Point() { X = 100, Y = 100},
        Content = "Cloud"
    };
    shapeCloud.Geometry = ShapeFactory.GetShapeGeometry(CommonShapeType.CloudShape);
But what i really want is something like :
    shapeCloud.Geometry = "M16.35,6.39 C16.28,7.36 12.26,20.45 12.26,20.45 L20.56,20.45 C20.56,20.45 16.64,7.54 16.53,6.39 z M12.30,0.50 L20.97,0.50 L32.50,33.50 L24.54,33.50 L22.23,26.16 L10.70,26.16 L8.42,33.50 L0.50,33.50 z"
Is there a way to do that?
Thanks

Thanks a lot!!