so I guess after all these releases with container support, MS did not make the behaviors of "add on drop" and "accept drops" work for containers??? (developer ==> behavior ==> add on drop / accept dropped shapes)
I probably being really obtuse, but I could never figure out what containers do that groups does not do.
A lot of truth, but not quite right.
So you're asked to find a solution for grouping shapes and do funny things with them - like displaying them as list, providing a title, requiring or excluding certain types of shapes, automatic resizing , etc.
So you start with groups and realize that you need to tweak them. Not only are they not only groups, with a lot of shapesheet stuff going under the hoods, but you realize too that you need some automatically running routines in the background.
Things going on and developing, you are now with a customized version of an otherwise called group. What about calling it "Containers" and let your employer sell it as new feature?
What at the end of the day it really is. Think of the timeline solution.