Build not copying Notifications DLL

I have a VS2005 project (Call is Project B) which references the
Notifications.dll and it is configured to copy locally at build time, but
when I build another project (Call it Project A) which has a reference to
Project B, the Notifications.dll (along with the ConfigurationInfo.dll and
SMO.dll) do not get copied to Project A's output directory. Has anyone
encountered this problem before? Is this a known issue with the
Notifications dll (I ask as other referenced projects with other references
are copied into Project A's output directory without any problems)?