Adding a JScrollPane to a JTextPane

Question

Hi,
I'm having problems adding a JScrollPane to a JTextpane. I expected you could add it just as you do with a JTextPane but for some reason it does not appear. Here is the code:
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
class ChatRoom extends JFrame implements ActionListener
     private     DefaultStyledDocument     doc;
     private     JTextPane                    pane;
     private JButton blueb, yellowb, redb, cyanb;
     private StyleContext sc;
     private JScrollPane scroll;
     public ChatRoom()
          setTitle( "Document     Handling Application" );
          setSize( 300, 190 );
          setBackground( Color.gray );
          JPanel topPanel     = new JPanel( new BorderLayout() );
          getContentPane().add( topPanel );
          // Create styles for the document
          sc = new StyleContext();
          doc = new DefaultStyledDocument( sc );
          // Create a text pane to display text
          pane = new JTextPane( doc );
          pane.setBackground( Color.white );
          pane.setEditable(false);
          scroll = new JScrollPane(pane);
          scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
          topPanel.add( pane, BorderLayout.CENTER );
          blueb = new JButton("Blue");
          blueb.setBackground(Color.blue);
          blueb.addActionListener(this);
          yellowb = new JButton("Yellow");
          yellowb.setBackground(Color.yellow);
          yellowb.addActionListener(this);
          redb = new JButton("Red");
          redb.setBackground(Color.red);
          redb.addActionListener(this);
          cyanb = new JButton("Cyan");
          cyanb.setBackground(Color.cyan);
          cyanb.addActionListener(this);
          JPanel buttonPanel = new JPanel();
          buttonPanel.add(blueb);
          buttonPanel.add(yellowb);
          buttonPanel.add(redb);
          buttonPanel.add(cyanb);
          topPanel.add(buttonPanel, BorderLayout.SOUTH );
     // Handle changes to the combobox (style changes)
     public void actionPerformed( ActionEvent e )
          MutableAttributeSet attr = new SimpleAttributeSet();
          if(e.getSource() == blueb) {
               StyleConstants.setForeground(attr, Color.blue);
          if(e.getSource() == yellowb) {
               StyleConstants.setForeground(attr, Color.yellow);
          if(e.getSource() == redb) {
               StyleConstants.setForeground(attr, Color.red);
          if(e.getSource() == cyanb) {
               StyleConstants.setForeground(attr, Color.cyan);
          pane.setCharacterAttributes(attr, false);
          try { doc.insertString( pane.getCaret().getDot(), "Hello \n", attr ); }
          catch( BadLocationException exception ) {}
          pane.grabFocus();
     // Main() method to     get     the ball rolling
     public static void main( String args[] )
          // Create an instance of the test application
          ChatRoom mainFrame     = new ChatRoom();
          mainFrame.setVisible( true );
}Thanks
Cath

Answer 1

yeah sorry, i'm being realy dumb :-), thanks very much for your help!
Cath