Problem with dialog styling - ui-widget-header class never created

Problem with dialog styling - ui-widget-header class never created


Hi All,
I'm using the latest Google-hosted versions of jQuery: 1.3.0 with
jQueryUI 1.5.3.
When I download the 1.5-compatible theme from Themeroller, all of the
interesting styles for dialog boxes appear to be in ui.theme.css under
classes like "ui-widget-content" and "ui-widget-header".
And, in the themeroller demo, the dialog box has that class applied.
So it looks good.
When I create a new dialog, I get no such classes inserted. I get all
of the "ui-dialog-..." classes, but none of the "ui-widget-..."
classes, and as a result my dialogs look broken, have no chrome, etc.
Any ideas what's going on? It definitely feels like I'm missing
something.
Confusing things further, when I download the themeroller package
labeled for jquery UI 1.5, it includes a copy of 1.6rc5 in it.
Thanks!
Tom