This method is used to invoke a part of expanded objects separately.
When activate specifies an alternate_method_id, the Acitivty Tool
detects an alternative method automatically from a list of grouped objects.
If found, such an object is activated separately by using the alternate
method.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5746 20353a03-c40f-0410-a6d1-a30d3c3de9de