 	import mx.core.Application;
 	import mx.core.IToolTip;
 	import mx.managers.ToolTipManager;
+	import mx.utils.ObjectUtil;
 	
 	import weave.Weave;
 	import weave.api.data.IAttributeColumn;

			if (additionalColumns != null)
				columns = columns.concat(additionalColumns);
			var headers:Array = probeHeaderColumns.getObjects(IAttributeColumn);
			var keys:Array = keySet.keys;
			var key:IQualifiedKey;
			var recordCount:int = 0;
			var maxRecordsShown:Number = Weave.properties.maxTooltipRecordsShown.value;

			// calculate y pos depending on toolTipAbove setting
			if (toolTipAbove)
			{
				y = stageY - (probeToolTip.height + 2 * margin);
				if(yAxisToolTip != null)
					y = yAxisToolTip.y - margin - probeToolTip.height ;
			}
