private void ChangeRegionContext(object regionContext)
        {
            IEntityRegionContext entityRegionContext = regionContext as IEntityRegionContext;

            EntityId = entityRegionContext == null ? (long?)null : entityRegionContext.EntityId;
            RefreshPageData();
        }
 private void SetMultiPageBottomRegionContext(IEntityRegionContext pageRegionContext, long context)
 {
     pageRegionContext.EntityId = context;
     if (EventAggregator.GetEvent <ChangeMultiPageBottomRegionContextEvent>() != null)
     {
         EventAggregator.GetEvent <ChangeMultiPageBottomRegionContextEvent>().Publish(pageRegionContext);
     }
 }