private Component buildBasicInfoPanel() {
		JPanel panel = new JPanel(new PairLayout(5, 10, 150));
		panel.setBorder(BorderFactory.createEmptyBorder(5, 7, 4, 5));

		panel.add(new GLabel("Block Name:", SwingConstants.RIGHT));
		panel.add(buildNameField());
		panel.add(new GLabel("Start Address:", SwingConstants.RIGHT));
		panel.add(buildAddressField());
		panel.add(new GLabel("Length:", SwingConstants.RIGHT));
		panel.add(buildLengthField());
		panel.add(new GLabel("Comment:", SwingConstants.RIGHT));
		panel.add(buildCommentField());

		return panel;
	}
Define the Main panel for the dialog here.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/AddBlockDialog.java