title: Removing the "Categories" field from an Issue Tracking list in SharePoint
body: <p>When I create an Issue Tracking list in SharePoint, I am unable to remove the Categories choice field that it adds by default as part of the Issue content type.  I looked in the list definition but I can't find anything explicit about not allowing the column to be deleted.  Does anybody know why the Delete button isn't showing up?  Is there a way to delete this field?</p>