How to get a scroll bar to scroll down as new elements are added

I have a JPanel that displays a list of information. As new information is added to the bottom of the list, a scroll bar appears. I require the scroll bar to scroll down as the new elements are added so that the most recent one's are in view all the time. Any ideas on how to do this?
Thanks

before adding each component.
get the scrollbar object
store the
ScrollBar sb = JFrame.getScrollBar();
int cmax = scrollbar.getVisibleAmount();
add component .....
int nmax = scrollbar.getVisibleAmount();
int diff = nmax - cmax;
sb.setValue(sb.getValue() + diff);
assuming you can get the scrollbar object from the
JFrame, ContentPane of JScrollPane.

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