title: how to fix child window on browser scroll without hard coded javascript?
body: <p>I have Ext Js application. Left side I have menu and right side Dashboard(portal style). On menu click I open every new window(part) on dashboard. 
  Lest say every new window(part) is new module in my application so I have grids, panels, navigation buttons inside.</p>
  
  <p>Now I have problem with child window. when I open child window inside this module window it's ok. when I am trying to move this child window from it's parent it's impossible and it's ok. but If I open many parts on my screen browser makes scroll and child windows moves on scroll and escapes from parent. </p>
  
  <p>Can someone help me? how to fix child window on browser scroll without hard coded javascript?</p>