Provides a registry of all components which have been instantiated
By providing an id for the component you can access quickly and easily with Ext.getCmp
// Create an Ext.Window and provide it with an id of 'myWin'
var a = new Ext.Window({
id: 'myWin',
width: 400,
height: 400,
closeAction: 'hide',
html: 'Sample content for a demo'
});
a.show();
// retrieve myWin
Ext.getCmp('myWin').hide();