Hi Mike,
I appreciate your quick reply, thanks!
Actually the second manner is the one we are going to need, since the messages themselves come from various sources, and we need to be able to control them visually within the application's scope, on the client side, according to whatever business logic is relevant to each of them.
That's exactly what I'm trying to implement right now - selections according to spatial and alphanumeric queries.
In the mean time, I've been trying to make the unselected graphics to have a different opacity value than the ones that are selected, but ran into a problem there as well, since the MultiLayerSymbol does not support it.
If you could suggest an idea as to how to control the opacity of individual graphics within the message group layer - that would be awesome.
Thanks!
Miri.