diff -r 000000000000 -r d970ebf37754 wp/wp-includes/js/tinymce/utils/editable_selects.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/tinymce/utils/editable_selects.js	Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,70 @@
+/**
+ * editable_selects.js
+ *
+ * Copyright 2009, Moxiecode Systems AB
+ * Released under LGPL License.
+ *
+ * License: http://tinymce.moxiecode.com/license
+ * Contributing: http://tinymce.moxiecode.com/contributing
+ */
+
+var TinyMCE_EditableSelects = {
+	editSelectElm : null,
+
+	init : function() {
+		var nl = document.getElementsByTagName("select"), i, d = document, o;
+
+		for (i=0; i<nl.length; i++) {
+			if (nl[i].className.indexOf('mceEditableSelect') != -1) {
+				o = new Option(tinyMCEPopup.editor.translate('value'), '__mce_add_custom__');
+
+				o.className = 'mceAddSelectValue';
+
+				nl[i].options[nl[i].options.length] = o;
+				nl[i].onchange = TinyMCE_EditableSelects.onChangeEditableSelect;
+			}
+		}
+	},
+
+	onChangeEditableSelect : function(e) {
+		var d = document, ne, se = window.event ? window.event.srcElement : e.target;
+
+		if (se.options[se.selectedIndex].value == '__mce_add_custom__') {
+			ne = d.createElement("input");
+			ne.id = se.id + "_custom";
+			ne.name = se.name + "_custom";
+			ne.type = "text";
+
+			ne.style.width = se.offsetWidth + 'px';
+			se.parentNode.insertBefore(ne, se);
+			se.style.display = 'none';
+			ne.focus();
+			ne.onblur = TinyMCE_EditableSelects.onBlurEditableSelectInput;
+			ne.onkeydown = TinyMCE_EditableSelects.onKeyDown;
+			TinyMCE_EditableSelects.editSelectElm = se;
+		}
+	},
+
+	onBlurEditableSelectInput : function() {
+		var se = TinyMCE_EditableSelects.editSelectElm;
+
+		if (se) {
+			if (se.previousSibling.value != '') {
+				addSelectValue(document.forms[0], se.id, se.previousSibling.value, se.previousSibling.value);
+				selectByValue(document.forms[0], se.id, se.previousSibling.value);
+			} else
+				selectByValue(document.forms[0], se.id, '');
+
+			se.style.display = 'inline';
+			se.parentNode.removeChild(se.previousSibling);
+			TinyMCE_EditableSelects.editSelectElm = null;
+		}
+	},
+
+	onKeyDown : function(e) {
+		e = e || window.event;
+
+		if (e.keyCode == 13)
+			TinyMCE_EditableSelects.onBlurEditableSelectInput();
+	}
+};