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 {
                       
                        xtype:'picker',
                        id:'picker',
                        slots: [
                            {
                                name: 'limit_speed',
                                title: 'Speed',
                                data: [
                                    {text: '50 KB/s', value: 50},
                                    {text: '100 KB/s', value: 100},
                                    {text: '200 KB/s', value: 200},
                                    {text: '300 KB/s', value: 300}
                                ],
                                 listeners:
                                { 
                                 select:function( t, record, eOpts ){
                                alert(JSON.stringify(record.getData().text));
                            }}
                            },
                            
                        ]
                        
                    },