Here is a concrete example of my (strange) problem :

First : When i click on 'myButton', this action will refresh the current tab in my tabPanel :
  return false;
Second : when refresh is over, 'myCallback' function is called and tries to apply something to a DOM element (thanks to its html ID).
function myCallback(){
The problem : when callback function is called, there seem to be 2 elements with same ID ??
And when I click on 'myButton' a second time, there 3 elements with same ID...

Thus, I think that the 'refresh()' method duplicates the DOM content (even if only one 'instance' of this content is visible).

My Question : is there a way to force a real reload / refresh of a tab's content, without duplicating it ?

Thanks very much for your help,