opening a window in center of screen while clicking the link in vaadin 6

Sir ,
I am using the Link component in Vaadin . And I can open the page in a new tab and new window . How to make a window aligned in Center ?

If you mean a popup-window within the new page, then, although as the JavaDoc of the method says there are some issues with it. If you mean how to open a new browser window centered, that I have never attempted.