NumberFormat should work with BarCharts. The hack around the problem of different colored bars for negative and positive values is to create a DataView with 3 columns: 1 for your labels and 2 calculated columns, 1 positive values and 1 negative values. Set the colors option array to two colors and the isStacked option to true. You should be all set. See example here: http://jsfiddle.net/JKZQH/
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