Expand volume on MSA 1050

Hello,

I have 2 pools on a MSA 1050: pool A with 1 disk group with 4 SSD disks and pool B with 1 disk group with 7 SAS disks.

On this MSA I have 2 volumes: volume SSD linked to pool A and volume SAS linked to pool B.

I have added 4 SSD disks to the device, and I have created a second disk group on pool A, but, how can I expand the volume SSD to use the new disk group? because the volume have the same available disk space than had before...