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ComboBox selection event

<html> <head> <title>Hello World Window</title> <link rel="stylesheet" type="text/css" href="ext-3.0.0/resources/css/ext-all.css" /> <script type="text/javascript" src="ext-3.0.0/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="ext-3.0.0/ext-all.js"></script> </head> <body> <script type="text/javascript"> Ext.onReady(function() {       var values = new Ext.data.SimpleStore({           fields: ['id', 'value'],           data : [['1','A'],['2','B'],['3','C']]       });     new Ext.FormPanel({        url: 'your.php',       renderTo: Ext.getBody(),       frame: true,       title: 'Title',       width: 250,       items: [               {             xtype: 'combo',             name: 'value',             fieldLabel: 'Value',             mode: 'local',             store: values,             displayField:'value',             width: 130,             listeners: {               select: function(f,r,i){                 Ext.Msg.alert('Title',i);               }             }                       }       ]     }); }); </script>  <div id='div1'>asdf</div> </body> </html>