Ext.window.Window creates a iframe , any other component which I can use as it?

Hello Guys,

I am using Extjs 4.2. I am using Ext.window.Window component which contain a Ext.form.Panel . But, problem what I am getting is Window is creating iframe when I am inspecting element in Google chrome.

I need to show a image which is wrapped horizantally at one edge. I want It should get wrapped on one edge of window. Is there any other component, then Window I can use, which does not create a iframe or I can place a image on top of that. your help will be appricated. you can mail me on singhranjay@gmail.com as well.

Thanks