I've downloaded a plugin for tinyMCE I want to use in the CMS Silverstripe backend. I've tried to add the line in mysite/_config.php as told in http://doc.silverstripe.org/htmleditorconfig
HtmlEditorConfig::get('cms')->enablePlugins('../../textmetrics'); HtmlEditorConfig::get('cms')->addButtonsToLine(2, 'textmetrics'); // positions plugin
And added the Plugin into /sapphire/thirdparty/tinymce/plugins/textmetrics.
I've tried to use insertButtonsBefore insteat of addButtonsToLine just to see if there was a problem.
But nothing happens at all.... not even errormessages and I don't know what to do. I need extra plugins to load.