I have the following tool input parameter:

<param name="columns" type="select" multiple="true" label="Select which columns to output">
    <option>SIZE</option>
    <option>ES</option>
    <option selected="true">NES</option>
    <option>NOM p-val</option>
    <option selected="true">FDR q-val</option>
    <option>FWER p-val</option>
    <option selected="true">RANK AT MAX</option>
    <option>LEADING EDGE</option>
</param>

It displays a single select drop-down menu, is this a bug or did I configure something wrong?

To check I added display="checkboxes" to the param above and now it displays a multi select but when the form loads everything comes up checked it doesn't obey any of the selected="true"? Is this also a bug or must it be done a different way?

regards,
Leandro