protected JPanel buildMainPanel() {
		// give base class the panel it needs to complete its construction
		// and then finish building after base class is done
		mainPanel = new JPanel();
		mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));

		listModel = new DefaultListModel<>();
		setPluginPathsListData(Preferences.getPluginPaths());

		// construct the bottom error message panel
		JPanel statusMessagePanel = new JPanel();
		statusMessage = new GDLabel("Ready to set User Plugin Paths");
		statusMessage.setName("statusLabel");

		statusMessage.setForeground(STATUS_MESSAGE_COLOR);
		statusMessagePanel.add(statusMessage);

		// put the main panel together
		// make sure to construct the plugin paths panel, since that
		// creates the scroll pane we use for sizing the text fields on
		// subsequent panels
		mainPanel.add(buildPluginPathsPanel());
		mainPanel.add(Box.createVerticalStrut(10));
		mainPanel.add(Box.createVerticalGlue());
		mainPanel.add(statusMessagePanel);
		mainPanel.invalidate();

		// dialog sensitivity setup
		enableButtons(false);
		setApplyEnabled(false);

		return mainPanel;
	}
Define the Main panel for the dialog here.
@return JPanel the completed <CODE>Main Panel</CODE>
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/EditPluginPathDialog.java