Delphi 3 vs MS SQL 7 indexes

When using a TTable (in D3) to open a MS SQL 7 table, I notice that I
cannot designate an index (using the drop-downs in properties)...

Is this normal?

Am I overlooking some criteria that is keeping me from seeing the
available indexes?

(I know that there ARE indexes as well as a primary key for the table ..
using Enterprise Mgr.)

Thanks in advance for any help..