Someone

		int ret;
		ExecutorService executor = Executors.newFixedThreadPool(1);

		pdxctw.popupWindow(frame);
			
	        FutureTask<int> future = new FutureTask<int>(
	                new Callable<int>()
	                {
	                    public int call()
	                    {
	                        return <--- what goes here ?
	                    }
	                });
	        executor.execute(future);
			
		ret = pdxctw.getXCTIdx();