Trouble in Layout of Java Swing Gui

I'm a newbie of java and still learning. And here is the trouble I'm in while making the GUI. Its format supposes to be like this.

But instead of the above GUI, it's like this

My tutor said using the GridLayout for the main panel to show 3 other panels, then using the FlowLayout inside 3 panels. I did it, but it's still not working. By the way, how I can make the component being down the line? Please help and thank you. Here is my code of the class showing in image 2.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import model.*;

public class AddPanel extends CustomPanel
{
    private Cinema cinema;
    private Movies movies = new Movies();
    private Theatres theatres = new Theatres();
    private Sessions sessions = new Sessions();
    private AddMoviePanel panel1 = new AddMoviePanel();
    private AddTheatrePanel panel2 = new AddTheatrePanel();
    private AddSessionPanel panel3 = new AddSessionPanel();
    public AddPanel(Cinema cinema)
    {  
        this.cinema = cinema;
        setup();
        build();
    }

    public void setup()
    {  
        setLayout(new GridLayout(3, 1)); 
    }   

    public void build()
    {   
        add(panel1);
        add(panel2);
        add(panel3);
    }
    private class AddMoviePanel extends JPanel
    {
        private JTextField name = new JTextField(10);
        private JTextField cost = new JTextField(5);
        private setListener listener = new setListener();
        public AddMoviePanel()
        {
            setup();
            build();
        }

        public void setup()
        {
            setLayout(new FlowLayout(FlowLayout.CENTER));
        }

        public void build()
        {
            addTitle("Add a Movie");
            addPair("Movie name: ", name);
            addPair("Movie cost: ", cost);
            addButton("Set", listener);
        }
        private class setListener implements ActionListener
        {
            public void actionPerformed(ActionEvent e)
            {
                double thecost = Double.parseDouble(cost.getText());
                String thename = name.getText();
                movies.add(thename,thecost);
            }
        }
    }
    private class AddTheatrePanel extends JPanel
    {
        private JTextField name = new JTextField(10);
        private JTextField gold = new JTextField(5);
        private JTextField regular = new JTextField(5);
        private setListener listener = new setListener();
        public AddTheatrePanel()
        {
            setup();
            build();
        }

        public void setup()
        {
            setLayout(new FlowLayout(FlowLayout.CENTER));
        }

        public void build()
        {
            addTitle("Add a Theatre");
            addPair("Theatre name: ", name);
            addPair("Number of gold seats: ", gold);
            addPair("Number of regualr seats: ", regular);
            addButton("Set", listener);
        }
        private class setListener implements ActionListener
        {
            public void actionPerformed(ActionEvent e)
            {
                int thegold = Integer.parseInt(gold.getText());
                int theregular = Integer.parseInt(regular.getText());
                String thename = name.getText();
                theatres.add(thename,thegold,theregular);
            }
        }
    }
    private class AddSessionPanel extends JPanel
    {
        private JTextField name = new JTextField(10);
        private JTextField movieid = new JTextField(5);
        private JTextField theatreid = new JTextField(5);
        private JTextField time = new JTextField(5);
        private JLabel sessiontime = new JLabel("Enter Session Time - 0 for 9am, 1 for 12noon, 2 for 3pm or 3 for 6pm");
        private JTextField goldprice = new JTextField(5);
        private JTextField regularprice = new JTextField(5);
        private setListener listener = new setListener();
        public AddSessionPanel()
        {
            setup();
            build();
        }

        public void setup()
        {
            setLayout(new FlowLayout(FlowLayout.CENTER));
        }

        public void build()
        {
            addTitle("Add a Session");
            addPair("Session name: ", name);
            addPair("Movie ID: ", movieid);
            addPair("Theatre ID: ", theatreid);
            add(sessiontime);
            addPair("Session time: ", time);
            addPair("Price for a gold seat: ", goldprice);
            addPair("Price for a regular seat: ", regularprice);
            addButton("Set", listener);
        }
        private class setListener implements ActionListener
        {
            public void actionPerformed(ActionEvent e)
            {
                int thegold = Integer.parseInt(goldprice.getText());
                int theregular = Integer.parseInt(regularprice.getText());
                int themovieid = Integer.parseInt(movieid.getText());
                int thetheatreid = Integer.parseInt(theatreid.getText());
                int thetime = Integer.parseInt(time.getText());
                String thename = name.getText();
                cinema.addSession(thename,themovieid,thetheatreid,thetime,thegold,theregular);
            }

        }
    }
}