Hi, the topic was mentioned in a post some months ago, but there wasn't a sample and the solution provided doesn't actually work (at least on IE7/8 and FF).

Stacked bars seem to became smaller in size when the number of them increases.

Isn't there a way to resize them other than using "style: {size: #}" in the series definition? (as suggested in the previos post and in the yahoo docs) this doesn't seem to work: bars are quite invisible and resize the chart height wouldn't be a solution in this case.

Thanks to anyone who could give me a help!

Code:
var store = new Ext.data.JsonStore({
    fields: ['yField', 'xField1', 'xField2', 'xField3', 'xField4', 'xField5', 'xField6', 'xField7', 'xField8', 'xField9', 'xField0'],
    data: [
		{yField:"03/2009",xField1:15,xField2:0,xField3:262,xField4:20,xField5:262, xField6:0,xField7:205,xField8:8,xField9:24,xField0:97},
		{yField:"04/2009",xField1:12,xField2:0,xField3:239,xField4:31,xField5:249, xField6:0,xField7:133,xField8:10,xField9:21,xField0:133},
		{yField:"05/2009",xField1:10,xField2:0,xField3:233,xField4:29,xField5:261, xField6:0,xField7:135,xField8:6,xField9:16,xField0:93},
		{yField:"06/2009",xField1:14,xField2:0,xField3:200,xField4:19,xField5:268, xField6:0,xField7:122,xField8:9,xField9:29,xField0:120},
		{yField:"07/2009",xField1:1,xField2:0,xField3:236,xField4:13,xField5:229, xField6:0,xField7:160,xField8:9,xField9:24,xField0:165},
		{yField:"08/2009",xField1:1,xField2:0,xField3:57,xField4:5,xField5:100, xField6:0,xField7:43,xField8:0,xField9:6,xField0:42},
		{yField:"09/2009",xField1:16,xField2:0,xField3:243,xField4:10,xField5:244, xField6:0,xField7:82,xField8:2,xField9:19,xField0:99},
		{yField:"10/2009",xField1:19,xField2:0,xField3:220,xField4:15,xField5:220, xField6:0,xField7:121,xField8:0,xField9:23,xField0:139},
		{yField:"11/2009",xField1:25,xField2:0,xField3:223,xField4:18,xField5:193, xField6:0,xField7:203,xField8:0,xField9:11,xField0:132},
		{yField:"12/2009",xField1:9,xField2:0,xField3:163,xField4:10,xField5:193, xField6:3,xField7:214,xField8:0,xField9:9,xField0:140},
		{yField:"01/2010",xField1:12,xField2:0,xField3:153,xField4:14,xField5:164, xField6:0,xField7:114,xField8:0,xField9:9,xField0:92},
		{yField:"02/2010",xField1:13,xField2:1,xField3:192,xField4:17,xField5:147, xField6:12,xField7:282,xField8:0,xField9:19,xField0:101},
		{yField:"03/2010",xField1:2,xField2:0,xField3:0,xField4:0,xField5:0, xField6:0,xField7:0,xField8:0,xField9:0,xField0:0}
	]
});

new Ext.Panel({
    width: 600,
    height: 300,
    renderTo: 'container',
    title: 'Stacked Bar Chart',
    items: {
        xtype: 'stackedbarchart',
        store: store,
        yField: 'yField',
        xAxis: new Ext.chart.NumericAxis({
            stackingEnabled: true
        }),
        series: [
			{xField:'xField1',displayName:'1',style:{size:20}},
			{xField:'xField2',displayName:'2',style:{size:20}},
			{xField:'xField3',displayName:'3',style:{size:20}},
			{xField:'xField4',displayName:'4',style:{size:20}},
			{xField:'xField5',displayName:'5',style:{size:20}},
			{xField:'xField6',displayName:'6',style:{size:20}},
			{xField:'xField7',displayName:'7',style:{size:20}},
			{xField:'xField8',displayName:'8',style:{size:20}},
			{xField:'xField9',displayName:'9',style:{size:20}},
			{xField:'xField0',displayName:'0',style:{size:20}}
		]
    }
});