[skrudjmakdak]

все)) сам нашел, как то так:

Ext.define("Ext.container.New_com",
	{
	extend: 'Ext.container.Container',
	alias: "widget.new_com",
	
	initComponent: function()
		{
		this.html = '<div id="' + this.getId() + '-new_com">123</div>';
		if (this.listeners == undefined)
			this.listeners = {};
		this.listeners.render = {};
		this.listeners.render.fn = function ()
			{
			var id = this.getId(),
				div = document.getElementById(id + '-new_com');
			
			console.log(div);
			}
		Ext.container.New_com.superclass.initComponent.apply(this, arguments);
		}
	});