Ext.ux.TDGi.iconMgr and Ext.ux.TDGi.iconBrowser are both singletons. Ext.ux.TDGi.iconMgr simply adds a stylesheet rules to your browser on the fly when you want icons. If the icon exists, then it simply reuses it. example.js

To Browse icons, Ext.ux.TDGi.iconBrowser.setPath('TDGi.icons').show();