Wysiwyg API plugin... how?

Hi,

I use the wonderfull Wysiwyg API ( 6.x-2.x ):
http://drupal.org/project/wysiwyg

With TinyMCE 3.2.3.1.
Works like a charm!

I added an extra button That inserts a

tag. I did that by copying the break code in wysiwyg/plugins and changed it to my needs.
I also crafted a module that filters for the tag... and creates columns (duh..)

All good and well... but now comes the hard part (... i'm a little lost ...) I want to include the code for the button in the module, so that i have one thing to install, (and one 'project' to maintain) and not 2 separate ones... a button and a filter.

I tried a lot... but i didn't succeed... can someone give me directions?
I tried this, a copy from break;

function wysiwyg_column_plugin() {
  $plugins = array();
  $plugins['column'] = array(
    'title' => t('Column break'),
    'vendor url' => 'http://drupal.org/project/wysiwyg',
    'icon file' => 'column.gif',
    'icon title' => t('Insert columns in the body'),
    'settings' => array(
    ),
  );
  return $plugins;
}

That works in the wysiwyg/plugins folder, but not in my module folder.

So i tried:

function column_wysiwyg_plugin() {
  $plugins = array();
  $plugins['column'] = array(
    'title' => t('Column break'),
    'vendor url' => 'http://drupal.org/project/wysiwyg',
    'icon file' => 'column.gif',
    'icon title' => t('Insert columns in the body'),
    'settings' => array(
    ),
  );
  return $plugins;
}

No luck... do i need to tell the api to look elsewhere... and if so... how?

Tnx!