after "Cnt +Z" not always callback event is fired automatically

[minbelapps]

Version: 2.5.9

If I change input value by keyword commands "Cnt +Z" call back is not fired automatically. I have added dynamic submit buttons and they are disabled, if no value provided. For example, user deletes everything with "Contr + all => delete", then pres "Cntr + Z" , the Editor shows some Json value in editor window, but submit button is disabled as callback event is not fired. This editor is on modal, so user closes the modal and only then the event is fired back.