Hello. I am new to Sencha so I maybe doing something obvious.I am trying to get the Treeview sample in the SDK to work; however when the page loads none of them render nodes: http://localhost/extjs/docs/index.html#!/example/tree/treegrid.html

I
also tried creating a new simple sample using code below but it also not work. The other samples work, just not treeviews. I downloaded ext.4.0.7 and i am binding to:
<script type="text/javascript" src="extjs/ext-all.js"></script>

Thanks for the help, I want to get rocking!

<script language='JavaScript' type='text/JavaScript'>
Ext.require([
'Ext.tree.*',
'Ext.data.*',
'Ext.tip.*'
]);


Ext.create('Ext.tree.Panel', {
renderTo: Ext.getBody(),
title: 'Simple Tree',
width: 150,
height: 150,
root: {
text: 'Root',
expanded: true,
children: [
{
text: 'Child 1',
leaf: true
},
{
text: 'Child 2',
leaf: true
},
{
text: 'Child 3',
expanded: true,
children: [
{
text: 'Grandchild',
leaf: true
}
]
}
]
}
});