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$field = 
  Rose::HTML::Form::Field::SelectBox->new(
...
$field->input_value([ 1, 3 ]);

print $field->html;

<select multiple name="whatever" size="3">
<option selected value="1">1</option>
...
<option selected value="3">3</option>
<option value="Three">Three</option>
</select>

$form = Rose::HTML::Form->new;

...

# Initialize the fields based on params
$form->init_fields();

print $form->start_html,
      $form->field('whatever')->html,
      ...
      $form->end_html;

[% form.start_html %]
[% form.field('whatever').html %]
...
[% form.end_html %]