Hi, I don´t know modifying the column color of the column chart when an event occurs:

Code:
 var columnChart = new Ext.Panel({ 
	    		id: 'columnChart',	
	    		...				
	            items: {
	                xtype: 'columnchart',
	                store: storeChart,
	                ...
			series: [{
	    			type: 'column',						
	    			style: {
	    				color: 0x15428B
	    			}	    	
	    		}],
	    	}				
	    });   
...
...
//event
//How can I modify columnChart -> items -> series -> style ->color?
Thanks!