Steps to reproduce

1. open http://zkfiddle.org/sample/38c9kts/3-Error-message-deleting-focus#source-1 with Firefox
2. close the error message

Actual result

Another error message ("Hehe, I'm still there ") shows.

• Sometimes when closing the error message, the javascript error below occurs. (I cannot find a deterministic way to reproduce it.)
  10:04:34.448 TypeError: this.parent is null1 zul.inp.wpd:832:3

Expected result

No onBlur event sent.

Debug information

• This issue happens on Firefox but doesn't happen on chrome and IE 10.
• This issue happens since 7.0.6 (including 7.0.6.1) but doesn't happen on 7.0.5 (and 7.0.1)