Problem with sizing

Question

I have this problem I cant figure out. I have this class that extends JPanel called Container. It's layout is BoxLayout (Y_AXIS), and has two components. One of the components is a JPanel with just a picture drawn in it, and the other is a control panel with play,fast forward, rewind, and pause buttons.
Then I have a ContainerPanels class which extends JPanel and is put into a JScrollPane. What I do is add/remove Containers to Container Panels. However, when I put some in so that the ContainerPanels panel isnt fully packed so that it starts to scroll, the individual Container panels get weird. The control panel gets off-centered from the picture panel.
In the Container class I set preferred width to be equal to the picture panel's width, and yet the control panel is all the way off to the right. Can anyone explain this?

Answer 1

yea I know its a bad name but its the best for its purpose and the only problem rly comes when I ask for help on these forums. Im not sure how a JTable would fix this, sorry if I explained it wrong. Heres the relevant code:
     public Container(String n, Experiment e)
          super();
          setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
          setBackground(Color.white);
          speedBar = new ContainerSpeedBar(this);
          picture = new ContainerPicture();
          Box pictureBox = Box.createHorizontalBox();
          pictureBox.add(Box.createHorizontalGlue());
          pictureBox.add(picture);
          pictureBox.add(Box.createHorizontalGlue());
          add(speedBar);
          add(pictureBox);
          setPreferredSize(new Dimension(picture.getPreferredSize().width,picture.getPreferredSize().height+speedBar.getPreferredSize().height+1));
     public ContainerSpeedBar(Container p)
          super();
          setLayout(new BoxLayout(this,BoxLayout.Y_AXIS));
          setBackground(Color.white);
          parent = p;
          Box control = Box.createHorizontalBox();
          control.add(rewind = new Rewind());
          control.add(play = new PlayPause());
          control.add(forward = new FastForward());
          Box control = Box.createHorizontalBox();
          add(control);
          add(display = new Display());
     public ContainerExplorer()
          super();
          setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
          scrollThread = new Thread(this);
          scroll = 0;
          add(new ScrollPanel(LEFT));
          scrollPane = new JScrollPane(containers = new ContainerPanels());
          scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          add(scrollPane);
          add(new ScrollPanel(RIGHT));
          scrollThread.start();
          public ContainerPanels()
//               setLayout(new RowLayout(10));
               setBackground(Color.white);
               Experiment e = new Experiment("",new DefaultSpecies());
               add(Box.createHorizontalGlue());
               add(new Container("",e));
               add(new Container("",e));
          }the problem is the ContainerSpeedBar appears far to the right of ContainerPicture and I cant understand y...