tinymce Ajax无法加载

I have a div loading tinymce by jquery-ajax like below:

$("#div").load("pageTinyMce.php");

I cannot get it work. Ive been on several forums and said to add

tinymce.execCommand('mceAddControl',true,'editor_id');
tinyMCE.init({ mode : "none"});

I'im using tinymce 4.x and where to add those codes.

For TinyMCE 4.x, the mceAddControl command doesn't appear to work any more. I've had some luck with the following:

tinymce.EditorManager.createEditor(id, tinyMCE.EditorManager.settings).render();

...where "id" is a variable containing the HTML ID of the field to get the control added to it.