Cloned button will not disable

A button created with clone() from another element will not be disabled by .button('disable').

.button('disable') works perfectly on arrays of buttons, but if a button was cloned before, it will not take the disabled method.

this happens even if you trigger the disable with a mouse click on another button (async false).

try it on a small sample here:

http://jsfiddle.net/eRLka/

I tryed on chrome and firefox.

buttons will output this in console:

0: button.cancel_all ui-button ui-widget ui-state-default ui-corner-all ui-button-text-icon-primary ui-button-disabled ui-state-disabled

1: button.cancel_all ui-button ui-widget ui-state-default ui-corner-all ui-button-text-icon-primary