Why does Tinymce fails to initiate once jquery dialog box is closed and reopened?

I have a jquery UI dialog box with tinymce inside of it, the first time I open the dialog box tinymce works fine but once I close the dialog box and reopen it I see the tinymce editor but I can't type anything inside as if it is disabled.

I have resolved the problem by delaying the function:

setTimeout(function() {

g = {};

g.oEditor = new tinymce.Editor (
    "notesComments",
    {
        // General options
        mode : "none",
        theme : "advanced",
        height : 350,
        plugins : "style,layer,table,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template",

        // Theme options
        theme_advanced_buttons1 : "newdocument,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull",
        theme_advanced_buttons2 : "formatselect,fontselect,fontsizeselect",
        theme_advanced_buttons3 : "undo,redo,|,sub,sup,|,charmap,iespell,media,advhr,|,print,|,ltr,rtl,|,fullscreen|,nonbreaking,pagebreak,hr",
        theme_advanced_buttons4 : "cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote",
        theme_advanced_buttons5 : "link,unlink,image,cleanup,code,|,insertdate,inserttime,preview,|,forecolor,backcolor",
        theme_advanced_buttons6 : "tablecontrols,|,removeformat,visualaid",
        theme_advanced_toolbar_location : "top",
        theme_advanced_toolbar_align : "left",
        theme_advanced_statusbar_location : "bottom",
        theme_advanced_resizing : false
    });

g.oEditor.render();

}, 3000);