Scroll a CRM 2011 Tab to the top when is expanded

Tailoring CRM 2011 Forms to customer needs often brings unusual requirements. What can we do if the user wants to automatically scroll a tab to the top when is expanded? We can use this function:

function ScrollTabToTop(executionObj) {
   // retrieve the current tab
   var currentTab = executionObj.getEventSource();
   // check if the click made the tab to be expanded
   if (currentTab.getDisplayState() == "expanded") {
      // set the focus to the current tab
      currentTab.setFocus();
   }
}

The function needs to be attached to the TabStateChange event for all the tabs.
Because the function use the Execution Context, is necessary to select the checkbox "Pass execution context as first parameter" when we add the handler: