delegate submit not working

delegate submit not working

Any idea why this submit event is not executing? It works fine if i change it to a "click" event and serialize the submit buttons parent form but i'd like to know why wont this work?

[code]
$(dialog).delegate("form#stayplanselect", "submit", function(event) {
    event.preventDefault();
    $.post("/admin/viewer/rates", $(this).serialize(), processResponse);
});
[/code]

Thanks.