[Boost-users] statechart - time event...implementation ?

It seems the current implementation of statechart library does not have timed event. It is possible to extend or specialize the current event<> class to achieve this ? Has anyone done this yet ? Looks like a common requirement for this type of event. Any reason why it is not part of this library offering ? Is it expected that users of this library do it themselves ? Thanks in advance. - Raja