TmActionEvents is a manager for the IDE-ActionLists-Events to which
everybody can add his own EventHandlers.

For example:

constructor TMyExpert.Create;
var
  ChaEvent: TNotifyEvent;
  ExEvent: TActionEvent;
  UpEvent: TActionEvent;
begin
  ChaEvent:= ChangeHandler;
  ExEvent:= ExecuteHandler;
  UpEvent:= UpdateHandler;
  TmActionEvents.AddListHandler(ChaEvent, ExEvent, UpEvent);
end;

destructor TMyExpert.Destroy;
var
  ChaEvent: TNotifyEvent;
  ExEvent: TActionEvent;
  UpEvent: TActionEvent;
begin
  ChaEvent:= ChangeHandler;
  ExEvent:= ExecuteHandler;
  UpEvent:= UpdateHandler;
  TmActionEvents.RemoveListHandler(ChaEvent, ExEvent, UpEvent);
end;
