/**
                             * Abstract class for creating groups of circles with the same styles and dimensions.
                             *
                             * @class CircleGroup
                             * @constructor
                             * @submodule graphics-group
                             */
                             CircleGroup = function()
                             {
                                CircleGroup.superclass.constructor.apply(this, arguments);
                             };
                            
                             CircleGroup.NAME = "circleGroup";
                            
                             Y.extend(CircleGroup, Y.ShapeGroup, {
                                /**
                                 * Algorithm for drawing shape.
                                 *
                                 * @method drawShape
                                 * @param {Object} cfg Parameters used to draw the shape.
                                 */
                                drawShape: function(cfg)
                                {
                                    this.drawCircle(cfg.x, cfg.y, cfg.radius);
                                }
                             });
                            
                            CircleGroup.ATTRS = Y.merge(Y.ShapeGroup.ATTRS, {
                                dimensions: {
                                    getter: function()
                                    {
                                        var dimensions = this._dimensions,
                                            radius,
                                            yRadius,
                                            width,
                                            height;
                                        if(dimensions.hasOwnProperty("radius"))
                                        {
                                            return dimensions;
                                        }
                                        else
                                        {
                                            width = dimensions.width;
                                            height = dimensions.height;
                                            radius = Y_Lang.isArray(width) ? this._getRadiusCollection(width) : (width * 0.5);
                                            yRadius = radius;
                                            return {
                                                width: width,
                                                height: height,
                                                radius: radius,
                                                yRadius: yRadius
                                            };
                                        }
                                    }
                                }
                            });
                            
                            CircleGroup.ATTRS = Y.ShapeGroup.ATTRS;
                            Y.CircleGroup = CircleGroup;