gform-columns.php

<?php 

add_action('gform_field_content', 'crb_gform_second_column', 10, 5);
function crb_gform_second_column($field_content, $field, $value, $zero, $form_id) {
	# The condition might be different depending on the choosen method
	if($field->cssClass == 'column_end' || $field->type=='section') {
		$field_content .= "</ul><ul id='gform_fields_$form_id' class='gform_fields right'>";
	}

	return $field_content;
}