JTree in JScrollPane doesn't scroll

I have a JTree in a JScrollPane that doesn't scroll.
Background: it used to!
History: I moved the creation of the JTree to inside an Object that returns it with a ".getTree()" method. Since then, it hasn't been scrolling. I even set the JScrollPane to always have scrollbars and they just sit there inactive.
Does anyone know what this would happen and/or how to fix it?
thanks.

That actaully worked, but it was way to big. I'm not sure what I did, but I changed the values to Studio ONE's defaults and now it works ok.

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Hello all.
bear with me a second, so I can explain what is happenning with my code. I have got a java application that is accessing an SQL database (either Oracle or postgreSQL) and inputing the data into a tree.
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This is my tree class which creates teh tree and adds it to the scrollPane object:
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import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.sql.*;
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          DefaultMutableTreeNode name = null;
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import java.sql.*;
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I would have thought creating a new Tree object over the original tree would have updated the scrollPane.
Any ideas would be awesome.
Thanks in advance.

and I create a new tree object with the new year details and nothing is changed in the scrollpane.Creating a new Tree doesn't add the tree to the scroll pane. It just changes the reference of the tree variable to point to the new Tree object. To update the scroll pane you would need to do:
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tree.setModel( model );

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Actually I am removing scrollPane from panel and then again creating tree inside scrollpane and adding it to Jpanel but the tree is not shown inside scrollpane. here is the dummy code.
please help me.
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hi sir ,
thaks for u'r suggession.Its working fine but the
properties of the previous tree were not working
after setModel() property .like action at leaf node
is not working,I'm sorry but I don't understand. I think you are saying that the problem is solved but I can read it to mean that you still have a problem.
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JTree in JScrollPane doesn't scroll

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