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+# GroupRenderer
+`GroupRenderer` is a special implementation of `XYSeriesRenderer` that combines multiple instances
+of `XYSeries` into a single virtual series of s higher dimension.  Examples of `GroupRenderer` are:
+
+* BarRenderer
+* CandlestickRenderer
+
+Let's take a quick look at `CandlestickRenderer`.  A candlestick chart is basically a two two dimensional 
+representation of a complex value; for every value of x a single candlestick is drawn, but there are 
+four values (dimensions) that make up each candlestick:
+
+* open
+* close
+* high
+* low
+
+When a series is added to the plot with a formatter associated with a renderer that extends `GroupRenderer`,
+all series added with formatters of the same type are automatically "grouped" together during rendering.