Im using tinymce in a textarea and the content the tinymce code is like:

1. tinymce.init({
2.     selector: 'textarea',
3.     plugins: 'image code link lists textcolor wordcount ' +
4.     '         hr pagebreak colorpicker textpattern anchor table media',
5.     relative_urls: true,
6.     file_browser_callback: function (field_name, url, type, win) {
7.         // trigger file upload form
8.         if (type == 'image') $('#formUpload input').click();
9.     }
10. });

And its working. But I would like to include in the "Insert" menu of the tinymce add a custom button to a custom functionality. Do you know how to achieve that?