Scroll bar remains up

hi all
i have developed a lan messenger to be installed in an organization.
it works fine except for the fact that when u start chating and the display area gets full the scroll bar remains up and u have to pull it down every time u want to see the new lines entered, although it should be the reverse. please suggest me how can i make the scroll bar slide down as more text is entered.

Simple :p
use a function like this every time that the pane is increased
public void actualizaBarra(){
outputPane.getVerticalScrollBar().setValue(outputPane.getVerticalScrollBar().getMaximum());
}This function set the scrollBar at the max value.
In my case the scrollPane is called outputPane.

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