unexpected tabbing behaviour in modal dialog

unexpected tabbing behaviour in modal dialog

I reviewed the forum and saw some discussions regarding this issue of maintaining the focus within a modal dialog, but I'm not sure if there was any conclusion.

looking at the modal dialog example:  http://jqueryui.com/demos/dialog/#modal-form

I get the following behaviour:

in Chrome:  tabbing leave the dialog and doesn't return focus

in Safari: tabbing leave the dialog and doesn't return focus

in FireFox:  works

any help would be greatly appreciated!

thanks,
Harrison