When the specified views appear to have finished closing on the Desktop it might seems that the method is hung. This is because closing the multithreading process may require additional time to complete.
If a view is in the process of closing, and you must wait for that view to finish closing before you can continue processing, this method can be called to act as an event semaphore. It can also be used to block the thread until a program exits when executed from a program object.