attrs.$observe('disabled', function() {
      // No need to use $eval() (thanks to ng-disabled) since we already get a boolean instead of a string
      $select.disabledFlag = attrs.disabled !== undefined ? attrs.disabled : false;
      $select.disabled = $select.disabledFlag || $select.disabledSelector;
    });

    scope.$watch(function () { return focusser.is(":disabled"); }, function (value) {
      $select.disabledSelector = value;
      $select.disabled = $select.disabledFlag || $select.disabledSelector;
    });

    //Don't disable this field, since it's css selector (:disabled) is being monitored to identify if it's in a fieldset.
    var focusser = angular.element("<input class='ui-select-focusser ui-select-offscreen' type='text' aria-haspopup='true' role='button' />");