Button: IE infinite loop

With IE9 when you add the class "ui-state-disabled" on a ui.button element, IE use 100% of CPU.

$('a.button').button('disable'); //-> infinite loop
$('a.button').addClass('ui-state-disabled'); //-> infinite loop also

To fixe this problem, I have added in my css this :

.ui-state-disabled {
   filter : none;
}