Nestedlist scroll down to position

[Simonhayre]

Here is a sample of my code.

var nestedList = new Ext.NestedList({
            name:'list',
            toolbar: {title:strDefaultTitle},
            items: [{
            {
                    text: html,
                    title: 'A',
                    items: [{
                            xtype: 'fieldset',
                            title: 'A1'
                        },{
                            xtype: 'fieldset',
                            title: 'A2'
                        },{
                            xtype: 'fieldset',
                            title: 'A3'
                        },{
                            xtype: 'fieldset',
                            title: 'A4'
                        },{
                            xtype: 'fieldset',
                            title: 'A5'
                        }]                
            },{
                    text: html,
                    title: 'B',
                    items: [{
                            xtype: 'fieldset',
                            title: 'B1'
                        },{
                            xtype: 'fieldset',
                            title: 'B2'
                        }]                
            }]
}); 

some how, when a user selects List A, I need the child of A to scroll down to A3 automatically. Anyone know how this can be done?