'Project Managers (Microsoft Project Server)' SharePoint group to have the Manage Permissions site permission

Hi

I am trying to develop an event handler that will provide Manage Permissions site permission to  'Project Managers (Microsoft Project Server)' SharePoint group. My idea is to add the Manage Permission role to the sharePoint group, everytime the project is published or the Project site is modified.

But I cannot figure out which event in Project server can handle this. I tried with Project-OnPublished and Reporting-OnProjectWorkspaceChanged events. On both events though I am successful to provide Manage permission to 'Project Managers (Microsoft Project Server)' SharePoint group, alll the existing users who belong to 'Project Managers (Microsoft Project Server)' SharePoint group, loose access on the Project Site.

Can anyone please suggest the eventhandler that will be called at the end of project publish.