title: ExtJS window jumps to the top when selecting a tab from a tab bar
body: <p>Just a quick question about tab bars in ExtJS. I have built windows with a lot of controls in and which concludes with a set of controls within each of 6 tabs in a tab bar. The controls in each tab are almost identical and I am not handling an tab changing events. When I select a tab, however, the focus returns to the top of the dialog (scrolling a fair way as it does so) and the user then has to manually scroll back down to the tab to see the controls now visible.</p>
  
  <p>Does changing tabs engender a windows refesh? If it does, is there any way I can stop this happening?</p>
  
  <p>I need to confess that this happening is restricted to only one of my two computers. I have installed the completed application in Azure and when I run it from machine1 in either IE or Chrome it works fine. But if I use machine2 with the same versions of IE and Chrome the jump and some strange events take place. Is there some machine dependent value that could cause the jump?</p>
  
  <p>Thank you</p>