You can ignore it. However there will be a small difference between the behavior in Release mode. In release mode the TextChanged event will fire immediately and in debug mode it will only fire after the current code is executed.
Yep, I'm getting it too. I'll ignore it, but I hope the MET library gets updated to remove the error. (I spent some time trying to fix it before thinking to search the forum.)
As I never use the debugger, I'm not personaly concerned. So this thing should be brought to my attention when I'm going to deliver a new version to fix a bug or add a suggested feature. I won't create a new version just to remove this warning.