<input type="button" id="show-win" value="Show Window"/>

<script type="text/javascript">

Ext.onReady(function(){

    var button = Ext.get('show-win');

    button.on('click', function(){
        // ajaxContent for the center
        var ajaxContent = new Ext.Panel({
            region: 'center',
            margins:'0 0 0 0',
            autoScroll:true,
            contentEl:'hidden-irr-region'
        });

        var win = new Ext.Window({
            title: 'IRR report in an ExtJS window',
            closable:true,
            closeAction:'hide',
            width:700,
            height:350,
            border:false,
            plain:true,
            layout: 'border',
            
            items: [ajaxContent],
            
            buttons: [{
                text:'Submit',
                disabled:true
            },{
                text: 'Close',
                handler: function(){
                    win.hide();
                }
            }]
        });

        win.show(this);
    });
});

</script>