elFinder

I'm not able to activate the elfinder button in the image dialog of elrte.
But the elfinder button is present in the flash dialog of elrte

Any suggestions?

I'm using the last version of elrte and elfinder.

The file manager is working except the preview of the file ('?' symbol on each file)

Configuration is:

    var opts = {
        absoluteURLs: false,
        cssClass : 'el-rte',
        lang     : 'en',
        width : 550,
        height   : 200,
        toolbar  : 'maxi',
        cssfiles : ['http://elrte.org/release/elrte/css/elrte-inner.css'],
        fmOpen : function(callback) {
            $('<div id="myelfinder" />').elfinder({
                url : '../connectors/php/connector.php',
                lang : 'en',
                dialog : { width : 900, modal : true, title : 'File manager' },
                closeOnEditorCallback : true,
                editorCallback : callback
            })
        }
    }
    $('textarea').elrte(opts);