fixed some minor issues
added a comment
reactivation method has to be improved
if a meta level is selected from the list it will be no longer selectable
until the specifying meta box is deleted
if a meta level is selected from the list it will be no longer selectable
until the specifying meta box is deleted
if a meta level is selected from the list it will be no longer selectable
until the specifying meta box is deleted
reActivateItem() was improved