Word interop. Long operation without locking the interface?

Question

JavaScript

I am writing an add-on for Word in c#. By pressing a button in the interface, a long work with the document should take place. How to correctly implement the process in the background so that it does not hang up the interface?
I tried using the standard Backgroundworker, but anyway, since there is a lot of work with the document itself, the entire interface freezes and is not updated until the end of the method.

Answer 1

if (ariaExpanded === 'true') {

Answer 2

Try a strict comparison
if (ariaExpanded === false) {