Place of Django template tags inside of ext3.0 viewport panels

Hello,

Does anyone know where I can find information on using ext3 with Django.
Specifically, I want to place Django template tags inside of a
particular panel in my ext3 viewport... I have tried what is seen below,
but it doesn't seem to work..

 var viewport=new Ext.Panel({
		    layout: 'border',
		    width:1200,
		    height:650,
		    renderTo: Ext.getBody(),
		    items: [{
		      region: 'north',
		      xtype: 'panel',
		      layout: 'fit',
-------------->	      html:{% placeholder base_content %},
		      width:1200,
		      height:50,
		    },{
		      region: 'center',
		....
		....
		...

Thanks, Bill