tinymce.init({
 file_picker_callback: function(callback, value, meta) {
 tinyMCE.activeEditor.windowManager.openUrl({
 url: "",
 title: "File Manager",
 width: window.innerWidth,
 height: window.innerHeight,
 onMessage: function(api, message) {
 callback(message.content, { alt: "File From Rich File Manager" });
 }
 });
 }
});