Modify edit text field to textarea

I am using PHPRunner 4.1. In a table, `presenter`, I have a field called `bio`, which is a long text field of a max 350 characters. I would like to change the field in view and edit pages to be a textarea, so that User can see the entire field when they area typing the bio.
From within the php page, presenter_edit.php, the program builds the below:
[codebox]<td width=250 class=editshade_lb style="padding-left:10px;">

{build_edit_control field="bio" value=$value_bio mode="edit"}

</td>[/codebox]
Which ends up being a small text input field that looks the same as the other text input fields on the page. I would like to make it a text area field, with 10 rows and 50 cols.
Any help appreciated.
r