Using JBoss Portal 2.7.2

It is a possibility to change dynamically the content of window?
A case:
Having in left layout a portlet that represents a menu, and in center layout we I need to change the portlet in dependencies that user selects from left menu.

Another case:
Having in a portlet a button and pressing this one I have to change this portlet with another one.

It is possible? I tried with window content to change the URI but doesn't work well.

Please help, I need this urgently...