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<input class="form-control" data-bind="value:ConfirmPassword, valueUpdate: 'afterkeydown'" id="ConfirmPassword" maxlength="20" name="ConfirmPassword" placeholder="Confirm New Password*" type="password" />

self.ConfirmPassword = ko.observable("").extend({ required: true }).extend({ equal: self.NewPassword });
self.SubmitButtonEnabled = ko.computed(function() {
    if (self.OldPassword() && self.NewPassword() && self.ConfirmPassword()) {
        return true;
    } else {
        return false;
    }
});