jQuery UI DialogWidget and tw2

[MHCPU]

I've been having some trouble creating a confirmer dialog using tw2.jqplugins.ui.DialogWidget.  I have it working by specifying the dialog's buttons in Javascript instead of tw2, but I'd like to understand why tw2 isn't working.

In the first example, I specify the buttons for the dialog as one of the dialog's options using tw2. When I click one of the dialog's buttons I get "TypeError: d.click.apply is not a function" in the Firebug console.

from tw2.jqplugins.ui import DialogWidget

confirmDialog = DialogWidget(id='confirm-dialog',
                             options={'modal' : True,
                                      'autoOpen' : False,
                                      'title' : 'Confirm save for later',
                                      'buttons' : [ { 'text': "Save", 'click':  'function() { $( this).dialog( "close" ); $("form").submit(); }' },
                                                    { 'text': "Cancel",  'click': 'function() { $( this ).dialog( "close" ); }' } ] })

In the second example I omit the 'buttons' option above, and add the buttons in a Javascript function.  That function gets called when the containing form's submit button is clicked.  This works.

function addButtonsAndOpen(dialogSelector) {

    $(dialogSelector).dialog({ buttons: [ { text: "Save", click:  function() { $( this).dialog( "close" ); $("form").submit(); } },
                                             { text: "Cancel",  click: function() { $( this ).dialog( "close" ); } } ] });


    $(dialogSelector).dialog("open");
}

js1 = 'addButtonsAndOpen("#confirm-dialog-later"); return false;'
submit1 = twf.SubmitButton(name='saveForLater', value='Save for later', attrs={'onClick' : js1 })

Am I specifying the button's 'click' functions incorrectly in the first example?  Or is this a tw2.jqplugins problem?

Any help appreciated,
Matthew