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.