root = new Ext.Panel({
    fullscreen: true,
    layout: 'hbox',
    version: '1.1.1',
    scroll: false,
    items: [{
        xtype: 'panel',
        width: '50%',
        height: '100%',
        layout: 'fit',
        items: [{
            xtype: 'list',
            itemTpl: '{display}',
            store: new Ext.data.Store({
                model: 'item',
                data: [...]
            })
         }]
    }, {
        xtype: 'panel',
        width: '50%',
        height: '100%',
        layout: 'fit',
        items: [{
            xtype: 'list',
            itemTpl: '{display}',
            store: new Ext.data.Store({
                model: 'item',
                data: [...]
            })
         }]
     }]
 });