private JPanel buildCallFixupPanel() {

		JPanel callFixupPanel = new JPanel();
		callFixupPanel.setLayout(new BoxLayout(callFixupPanel, BoxLayout.X_AXIS));

		callFixupComboBox = new GhidraComboBox<>();
		callFixupComboBox.addItemListener(e -> {
			if (e.getStateChange() == ItemEvent.DESELECTED) {
				return;
			}
			if (!NONE_CHOICE.equals(e.getItem())) {
				inlineCheckBox.setSelected(false);
			}
		});

		callFixupPanel.add(new GLabel("Call-Fixup:"));
		callFixupPanel.add(callFixupComboBox);

		callFixupPanel.add(Box.createGlue());
		callFixupPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

		return callFixupPanel;
	}
Method must be invoked following construction to fetch function info 
and update components.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/AbstractEditFunctionSignatureDialog.java