text: define(["dojo/_base/declare", "./Columns", "./commonStacked"], 
  	function( declare, Columns, commonStacked){
  
  	return declare(Columns, {
  		// summary:
  		//		The plot object representing a stacked column chart (vertical bars).
  		getSeriesStats: function(){
  			// summary:
  			//		Calculate the min/max on all attached series in both directions.
  			// returns: Object
  			//		{hmin, hmax, vmin, vmax} min/max in both directions.
  			var stats = commonStacked.collectStats(this.series);
  			stats.hmin -= 0.5;
  			stats.hmax += 0.5;
  			return stats; // Object
  		},
  		getValue: function(value, index, seriesIndex, indexed){
  			var x, y;
  			if(indexed){
  				x = index;
  				y = commonStacked.getIndexValue(this.series, seriesIndex, x);
  			}else{
  				x = value.x - 1;
  				y = commonStacked.getValue(this.series, seriesIndex, value.x);
  				y = [  y[0]?y[0].y:null, y[1]?y[1]:null ];
  			}
  			// in py we return the previous stack value as we need it to position labels on columns
  			return { x: x, y: y[0], py: y[1] };
  		}
  	});
  });
  