Vaadin Portlet - Application is not reset when page is loaded

Hi,

I have created a vaadin portlet in liferay. My problem is that when user reloads the page application does not reset .

For example:
suppose I have 2 pages in liferay "
PageA
" and "
PageB
".
On
PageA
I have a vaadin portlet having table of employees, when any row is clicked new screen is loaded showing employee details.

Now if I go to
PageB
and come back to
PageA
(Using menu). It still shows the employee details instead of employee list.
What I need is to reset the portlet when user comes back to the page.

Please Suggest.