contextMenus

Added in Office 2010

link - learn.microsoft.com/en-us/previous-versions/office/developer/office-2010/ee691832(v=office.14) 

<contextMenus idMso = "ContextMenuCell" > 
<item gallery id="MyGallery"  /> 
<item splitButton id="----"  /> 
<item menuSeparator id="---"  /> 
</comboBox> 

Attributes (properties)