Add child tag to div tag
<html> <head> <title>Hello World Window</title> <link rel="stylesheet" type="text/css" href="ext-3.0.0/resources/css/ext-all.css" /> <script type="text/javascript" src="ext-3.0.0/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="ext-3.0.0/ext-all.js"></script> <style type="text/css"> div { border : 1px solid #AAAAAA; width : 200; cursor : pointer; padding : 2px 2px 2px 2px; margin : 2px 2px 2px 2px; } </style> </head> <body> <script type="text/javascript"> Ext.onReady(function() { var myDiv1 = Ext.get('div1'); myDiv1.createChild({ tag : 'div', html : 'Child ' + 1 }); }); </script> <div id='div1'>asdf</div> <div id='div2'>asdf2</div> </body> </html>