Dialog overlay dissapears by closeing a dialog

I discovered an error while developing a webapp that uses multiple modal boxes one above the other.

Because every dialog is created with jquery dom the app removes each element after closing the dialog.

If the app generates multiple modal dialogs theres a bug: the overlay disappears from the dialog with the

smallest z-index.

So when I open a modal dialog from a modal dialog, then close the newly opened dialog and open a new one,

jqueryui uses the overlay from the dialog beneath it.

I created a sample here: http://jsfiddle.net/LvTwf/1/

The html modal boxes work, the automatic generated ones not really.