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Extend the LinkSeparator class and create a customized shape for your link separator by overriding the updateDisplayList method. Use this new class in the separatorSkin property of your Link Bar.
Use an ItemRenderer in your columnSeries that extends the UIComponent class and implement the IDataRenderer interface
Use an ItemRenderer in your columnSeries that extends the UIComponent class and implement the IDataRenderer interface and uses the graphics class to draw the line across your chart.