form_alter problem

Hi,
I'm trying to add additional exposed filter fields to a view via my module.
I've added a form_alter hook to my module with the following code:
if ($form_id == 'views_exposed_form') {
$form['recent_event_type'] =
array('#type' => 'select', '#options' => array(0 => t(''), 3 => 'Long', -3 => 'Short'),
'#default_value' => 0,
'#title' => t('Recent Event'),
'#weight' => -2,
);

$form['recent_event_date'] =
array('#type' => 'select', '#options' => array(0 => t(''), 1 => 'Last Day', 3 => 'Last 3 Days', 7 => 'Last Week'),
'#default_value' => 0,
'#title' => t('Event Date'),
'#weight' => -1,
);

The fields are added fine to the view page but the problem is that they are not in the same row - that is, the first field is added to the row with the other exposed filters (defined via Views interface) but the 2nd field is added to a row below - just under the previous field and the Submit button is pushed to another row lower - again directly below (not aligned to the left).

Also, I've seen using Themer-Info (devel) that when I go over one of those 2 new fields or the Submit button they are all being marked with the red rectangle [from themer] as the 'regular' exposed fields are being marked one at a time.

Looking at the generated html I see that there is a div with class 'views-exposed-widget' around each of the 'regular' exposed filters and than a div views-exposed-widget begins before my first added filter and closes after the submit button.

What am I doing wrong?
Thanks.