FRONTEND_MVC/components/admin/ckeditor/plugins/gallery/plugin.js

CKEDITOR.plugins.add( 'gallery', {
    icons: 'gallery',
    init: function( editor ) {
        editor.addCommand( 'gallery', new CKEDITOR.dialogCommand( 'galleryDialog' ) );
        editor.ui.addButton( 'Gallery', {
            label: 'Вставьте галерею',
            command: 'gallery',
            toolbar: 'insert'
        });

		 if ( editor.contextMenu ) {
            editor.addMenuGroup( 'galleryGroup' );
            editor.addMenuItem( 'galleryItem', {
                label: 'Редактировать галерею ',
                icon: this.path + 'icons/gallery.png',
                command: 'gallery',
                group: 'galleryGroup'
            });
			editor.on( 'doubleclick', function( evt ) {
				var element = evt.data.element;
				if ( $(element).attr('id') == 'widgetgallery' )
					evt.data.dialog = 'galleryDialog';
			} );
            editor.contextMenu.addListener( function( element ) {
                if ( element.getAscendant( 'gallery', true ) ) {
                    return { galleryItem: CKEDITOR.TRISTATE_OFF };
                }
            });
        }

        CKEDITOR.dialog.add( 'galleryDialog', this.path + 'dialogs/gallery.js' );
    }
});