Modal window does not disable child windows

[ianmillsom]

Upon reviewing this software I believe that there is a bug in the modal window which does not disable the child windows created (except the first one).

To review this bug go to http://romb.github.io/jquery-dialogextend/example.html

1. Click on 'New dialog' button and open 3-4 windows and move them so you can see them all.
2. In the 'Dialog' options box on the right side, tick 'Modal Dialog'
3. Click on 'New dialog' button again.

You should notice that the first window you opened is disabled and all others are not.

As a modal window is supposed to block access to all other sub windows created this looks to be a bug.

Upon inspection of the layers, it was noticed that the first dialog window that is created does not contain a z-index but others have got z-index.

Thank you.