private JComponent buildWorkPanel() {
		JPanel panel = new JPanel(new BorderLayout());
		panel.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
		panel.add(buildMainPanel(), BorderLayout.NORTH);
		panel.add(buildVariablePanel(), BorderLayout.CENTER);
		return panel;
	}
Define the Main panel for the dialog here.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/AddBlockDialog.java