How to use the events of a base director class in the level sequence editor?


in the level sequence editor I can create event tracks. The events fired by these tracks are evaluated in the level sequence director class of the level sequence. There may be much level sequences which are using exactly the same events, but with other data (i.e. the events are fired at different times/they are at different positions in the event track). So this is the classic case where a base class of the director blueprint is needed where the events are defined.
I can create a blueprint child of the level sequence director and then set the base class for the director of a specific level sequence as it. Then I can access the base events in the event graph. BUT they are not shown in the level sequence editor! When I right-click the keyframe, select properties and event, there are only the events I created in the child director class…
How to get this working?