how to access point data from members of a group

[Manticor]

I am stuck trying to figure this out . i have a few different meshes that are grouped.
I getData the group and can visualise certain data numerically ... i.e area .. which gives an area of area data for each member.
But I cant get the point data .. such as point posision /normal etc .. just turns a set data red when i try to visualise the data .
Closest i managed was to pipe the data into a sample set node with "all points " and then putting that into an add point node . ... but this gives me all the points ... without being split between number of members of the group

I just want to check the bounding box of each member of the group.

Anyone know the best way to do this ?