@Override
	public ProgramLocation getProgramLocation(int row, int col, ListingField bf) {
		Object obj = bf.getProxy().getObject();
		if (!(obj instanceof Function) || row < 0 || col < 0) {
			return null;
		}

		Function func = (Function) obj;

		return new FunctionPurgeFieldLocation(func.getProgram(), func.getEntryPoint(), col);
	}
@see ghidra.app.util.viewer.field.FieldFactory#getProgramLocation(int, int, ghidra.app.util.viewer.field.ListingField)
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/FunctionPurgeFieldFactory.java