Someone

 class TopMenu extends JPanel {
 	
 	JDialog menuDialog;    /////<<<<<<<<<<<<<<<<<<<<<<<
 	JPanel foodListPanel;
 	JButton addItemButton;
 	JButton removeButton;
 	JButton doneButton;
 	DefaultListModel menuItems;
 	JList list;
 	//JList priceList;
 	Font listFont = new Font("Courier New", Font.PLAIN, 15);
 	Font titleFont = new Font("Verdana", Font.BOLD, 25);
 	Font headingFont = new Font("Verdana", Font.BOLD, 10);
 	Color highlightColour = new Color(0,124,243);
 	Color titleColour = new Color(0,0,153);
 	
 	TopMenu(String menuName, JDialog menuDialog) {
 		super(new BorderLayout());
 		this.menuDialog = menuDialog;   ///<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
               ..........
ActionListener buttonListener = new ActionListener() {
 			public void actionPerformed(ActionEvent e) {
 				if (e.getSource() == addItemButton) {
 					
 				String item = JOptionPane.showInputDialog(null, "Enter Menu Item:", "Menu Item", JOptionPane.QUESTION_MESSAGE);
 					double price = 0.00;
 					
 					menuItems.addElement(new MenuItem(item,price));
 					
 					updateUI();
 				}
 				else if (e.getSource() == removeButton) {
 					try {
  						menuItems.remove(list.getSelectedIndex());
  						list.updateUI();
  						//priceList.updateUI();
  					}
  					catch (ArrayIndexOutOfBoundsException m) {
  						errorMessage("No value was selected");
  					}
 				}
 				else if (e.getSource() == doneButton) {
 	//PROBLEM HERE >>>>>		menuDialog.setVisible(false);
 				}
 			}
 		};
......