CategoryLabelPositions p1 = new CategoryLabelPositions(
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER), 
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER), 
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER), 
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER)