Why is it no longer possible, since the iPhotos upgrade to 9, to select a number of photos and "hold on to them" when changing to a different left-margin "view"?

Question

There has been a downgrade since iPhotos was… upgraded.
Before iPhotos was upgraded to 9, It USED to be that
IF you chose a photo or a number of photos WITHIN an event
(ensuring that they were engulfed in yellow or blue),
and THEN went to the left margin and clicked on Photos
in order to view the ENTIRE library's photos
(not just those in that particular event),
the selfsame photos would REMAIN chosen in the LARGER context.
That is no longer the case.
And that was very useful, because
if you wanted to move a batch of photos within one event
to within another event, that was the easiest way to do so
— whereas now, we have to search for and "find" them all over again.
When I go "back" to Photos, I not only lose the selected images,
say from March 2009, I end up at a totally different place,
say in October 2006, and I have to do lots more "work" finding
the photos again then used to be the case.

Answer 1

Flag the Photos.
Switch to Events View
Select the Target Event
Events menu -> Add Flagged Photos to Selected Event
Regards
TD