launch an eventuality accessors

how i launch an eventuality accessors :

public eventuality eventhandler canexecutechanged
    {
      add
      {
        commandmanager.requerysuggested += value;
      }
      remove
      {
        commandmanager.requerysuggested -= value;
      }
    }

if normal eventuality i launch by:

canexecutechanged(sender, eventargs..). 

but here doesn't work - i wholly

canexecutechanged +=..

to insert slight eventuality - nonetheless i can't launch it.

also support theme appreciated.
thanks.

edit
the eventuality category implementing icommand wpf. there's zero some-more arrangement :).
and - commandmanager.requerysuggested(this, eventargs.empty); doesn't work.

edit2 certain contend - jon's instance should have worked nonetheless even supplement slight called justly - i try eventuality - it's zero :|. i substantially
drop events accessors.