Determine index of line sap.m.table where something was changed

Hello,

i have an sap.m.table wiht

C1 C2 C3 C4 c5

Text text Radiobuttongroup Text
..

..

Text text Radiobuttongroup Text.

When a radiobutton is selected the onSelect Event is triggerd.

Is there an easy way to get the Index of the line in the table where the button was selected?

At this moment i use oEvent.getId() and split it so that i get the index number from there.
Is there an easier way to accomplish that?

Regards

Dirk