Align Command and SubObjects

Hello there, align command doesn’t seem to be working with subobjects.

  1. I select 2 subobjects
  2. Enter “Align” command
  3. The subobjects get deselected and prompt displays “Select objects to align”.

Does anyone else see that? It would be very useful to be able to align subobjects…

My system is:
Windows 8.1
Rhino 6.21