basicevent description field too short if tinymce installed

I have installed tinymce and one effect is the event description area in basicevent type is too short. The toolbar header for tinymce takes up all the room in the basicevent description, leaving a very short text editing area.

In basicevent_form I changed the definition for the body form element to this:

  $form['body_filter']['body'] = array(
    '#type' => 'textarea', 
    '#title' => t('Body'), 
    '#default_value' => $node->body, 
    '#rows' => 30,
    '#cols' => 60,
    '#required' => TRUE
  );

That's a bit better as there are more rows, but with that the width of the description field is too wide.