Custom properties not being delated from entity table on disable

Hi,

I've implemented the following custom property as shown below.
Creating a new property using varchar255 will add the column in the table. However disabling the new created property did not removed the column from entity table.

However enabling and disabling the default properties will add/remove the columns from entity table just fine.

Mihai,

/**
 * Implemetation of hook_eck_property_types ($type, $schema)
 */
function eckextra_eck_property_types_alter(&$property_types) {
  $property_types['varchar255'] = array(
      'type' => 'varchar255',
      'label' => 'Varchar 255',
      'settings' => array(),
      'class' => 'Varchar255PropertyType',
      'file' => false,
      'description' => '',
  );
class Varchar255PropertyType implements PropertyType {

  public static function schema() {
    $schema = array(
        'description' => 'Varchar',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
    );

    return $schema;
  }

  public static function validate($value) {
    return TRUE;
  }

}