laf-extjs-ui-demo

gistfile1.html

<script>
Ext.create('Ext.window.Window', {
    title: 'Hello',
    height: 200,
    width: 400,
    layout: 'fit',
    items: { 
        xtype: 'grid',
        border: false,
        columns: [{header: 'World'}],
        store: Ext.create('Ext.data.ArrayStore', {})
    }
}).show();
</script>