Excel/RibbonUI menu disabled - excel

Question

Note The following problem was solved by creating a new workbook copying all the data, macros and other code across. Any insight into what causes a workbook to "break" would be welcome!
I have an excel file with a custom ribbonui. I've recently added a new group with a new menu, it (was) copied from the first group and certain items were removed.
The first group "library" and all its controls work as expected. The "documentmenu" menu in the "document" group however is grayed out and I cannot figure out why!
I've tried adding in a getEnabled and plain enabled attribute to the menu but it wont fire, neither will any of the getEnabled events for the menu's contained buttons.
When I open the ribbon for the first time the getLabel event does fire and sets the label correctly.
I've tried re-naming the group and all the controls to something without "document" in-case it's conflicting somehow, but again no go.
Does anyone know what might be causing this to happen?
Below is the entire customui xml file.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<customUI
onLoad="CustomUI.Ribbon_onLoad"
xmlns="http://schemas.microsoft.com/office/2009/07/customui">
<ribbon>
<tabs>
<tab
id="Main"
label="Initech">
<group
id="Library"
label="Library"
tag="Library"
centerVertically="true">
<menu
id="LibraryMenu"
tag="Library"
image="gear"
getLabel="CustomUI.Menu_getLabel">
<button
id="LibraryMenu_Open"
tag="Library"
label="Open Library"
imageMso="FileOpen"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="LibraryMenu_New"
tag="Library"
label="New Library"
imageMso="FileNew"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<menuSeparator
id="LibraryMenu_Separator0" />
<button
id="LibraryMenu_Save"
tag="Library"
label="Save"
imageMso="FileSave"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="LibraryMenu_Close"
tag="Library"
label="Close"
imageMso="FileClose"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="LibraryMenu_Default"
tag="Library"
label="Set as Default"
imageMso="AcceptInvitation"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<menuSeparator
id="LibraryMenu_Separator1" />
<button
id="LibraryMenu_Add"
tag="Library"
label="Add Component"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="LibraryMenu_Editor"
tag="Library"
label="Edit Menu"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
</menu>
<dynamicMenu
id="LibraryComponents"
tag="Library"
image="book_stack"
getLabel="CustomUI.Menu_getLabel"
getEnabled="CustomUI.Menu_getEnabled"
getContent="CustomUI.Menu_getContent" />
</group>
<group
id="Document"
label="Document"
tag="Document"
centerVertically="true">
<menu
id="DocumentMenu"
tag="Document"
imageMso="FileOpen"
getLabel="CustomUI.Menu_getLabel">
<button
id="DocumentMenu_Open"
tag="Document"
label="Open Document"
imageMso="FileOpen"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="DocumentMenu_New"
tag="Document"
label="New Document"
imageMso="FileNew"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<menuSeparator
id="DocumentMenu_Separator0" />
<button
id="DocumentMenu_Save"
tag="Document"
label="Save"
imageMso="FileSave"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
<button
id="DocumentMenu_Close"
tag="Document"
label="Close"
imageMso="FileClose"
getEnabled="CustomUI.Button_getEnabled"
onAction="CustomUI.Button_onAction" />
</menu>
</group>
</tab>
</tabs>
</ribbon>
</customUI>
Update after hours of playing about trying to figure out whats going on, turns out my workbook is damaged some how. The code works fine if I put it into a new workbook.

Answer 1

centerVertically is not a valid property.
Kindly refer this link
getEnabled="CustomUI.Button_getEnabled" & onAction="CustomUI.Button_onAction"
Avoid period . in name of callback function as we cannot define a sub/function like CustomUI.Button_getEnabled.
3 when using getEnabled attribute for a button a callback function is to be called when the application needs to determine the enabled state of the button.
sample code - getEnabled for ribbion