Editor.js

            dialogDefinition.onShow = function () {
                oldOnShow.bind(this)();

                var UrlGroup = this.getContentElement("info", "url").getElement().$;

                if (UrlGroup.getElement('.qui-button')) {
                    return;
                }

                var UrlInput = UrlGroup.getElement('input[type="text"]');


                Button = new Element('button', {
                    'class': 'qui-button',
                    html   : '<span class="fa fa-picture-o"></span>',
                    events : {
                        click: function () {
                            self.openMedia({
                                events: {
                                    onSubmit: function (Win, data) {
                                        UrlInput.value = data.url;
                                    }
                                }
                            });
                        }
                    }
                }).inject(UrlGroup);


                Button.getPrevious().setStyles({
                    'width': '85%',
                    'float': 'left'
                });
            };

            return ev;
        }

    });
});