Ajax breaks saveguard

How to replicate on a example rules form that uses ajax:
* On a rule: "add action"
* On new screen, select: "set a data value"
* On ajax-reloaded screen: select anything as data selector
* click "continue"

result: saveguard message, this should not.

analysis: i suppose the js code that marks submit buttons as ok is executed on pageload, but not on ajax.
if that ajax carries a submit button, this issue arises.

proposed solution: do it right and use behaviors, this should be fixed.