I use this configurations but codesnippets don't show up

CKEDITOR.editorConfig = function( config ) {

    config.allowedContent = true;

    config.toolbar =
    [

        [ 
            'Bold','Italic','Underline' ,
            'Link','Unlink' ,'Image','TextColor','BGColor','BulletedList',
            'Blockquote','Table','HorizontalRule',
            'PasteText',
            'JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock','BidiLtr','BidiRtl' ,                             
            'Outdent','Indent','ShowBlocks','SpecialChar',
            'RemoveFormat' , 'Source' , 'Maximize','codesnippet'
        ] 


    ];    

    config.height=100;


    config.defaultLanguage = 'ar';
    config.language = 'ar';    

    config.extraPlugins = 'autolink,widget,dialog';       

};

I need some help please

i have the plugin placed in the plugins , and the core file is built with codesnippts