Buttons order in the dialog

There seem to be no officially documented way to ensure the order of the buttons in a dialog.

With the current release 1.6rc6 if the buttons specified as

buttons:{OK:function(){}, Cancel:function(){}}

the buttons are actually rendered in the following order: Cancel, OK

If this is intended, it should be documented.

If this is not intended, then perhaps the order of the object properties should be taken into account.