how to make instance in portlet for multiple use in server

Explanation: In this generally how we can make a instance of portlet, likewise
if we click on sample in liferay server and if we click one portlet then the portlet will display but if we
click one more time it will not take for that solution we can make a instanceble for this portlet

                                         ..just go to liferay-portlet.xml 

                                       put this code

                          <instanceble>true<instanceble>

                                                              hope this helps you...