add additional plugin to TinyMCE Advanced

Hi,
I just sent a message to Andrew, but realised that my people might benefit by posting my question here.

I’m trying to add an additional plugin to your fantastic TinyMCE Advanced WordPress plugin, but so far have failed.
The plugin is quite simple and works in a stand alone TinyMCE (code below).
I created a new folder in /plugins and uploaded the plugin files.
I have added the plugin name to $tadv_plugins in tadv_defaults.php and included the buttons in $tadv_toolbars, $tadv_btns1 and $tadv_allbtns in the same file.
I have copied the button images in the /images folder and added the image descriptions to the $buttons array in tadv_admin.php.

The buttons show up on the TinyMCE Buttons Arrangement page, but not on the Add New Post page.

What have I forgotten? Is the plugin not loading or are the buttons just not visible?
I should also mention that my plugin file editor_plugin.js loads the button image files in the addButton function (image : ‘button.gif’,), however you seem to have extracted all image files from the standard TinyMCE plugins?

I’ve spent the last 4 hours trying to figure this out, any help would be really appreciated.

Thanks in advance.

(function() {
    tinymce.create('tinymce.plugins.Speechballoons', {
        init : function(ed, url) {
            	ed.addCommand('insertyoububble', function() {
				ed.execCommand('mceInsertContent', false, 'just some text');
				});

				ed.addCommand('insertmebubble', function() {
				ed.execCommand('mceInsertContent', false, 'just some text');
				});

				ed.addButton('me', {
					title : 'insertme_desc',
					image : 'me.gif',
					cmd : 'insertmebubble'});

				ed.addButton('you', {
					title : 'insertyou_desc',
					image : 'you.gif',
					cmd : 'insertyoububble'});
        },

        createControl : function(n, cm) {
            return null;
        },
        getInfo : function() {
            return {
                longname : "Steve Speechballoons",
                author : 'Steve',
                authorurl : 'https://test.com/',
                infourl : 'https://test.com/',
                version : "1.0"
            };
        }
    });
    tinymce.PluginManager.add('speechballoons', tinymce.plugins.Speechballoons);
})();