private void populateExternalNames() {
		String[] names = program.getExternalManager().getExternalLibraryNames();
		extLibNameComboBox.clearModel();
		extLibNameComboBox.addItem(Library.UNKNOWN);
		Arrays.sort(names);
		for (String name : names) {
			if (Library.UNKNOWN.equals(name)) {
				continue;
			}
			extLibNameComboBox.addItem(name);
		}
	}
Creates an external location or external function.
@param program the program to which the new external location will be added
@param externalLibraryName the name of the external library that the dialog should use
by default.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/symboltree/EditExternalLocationPanel.java