index of push buttons

[Danko Radic]

When reading selection from goup of PUSH BUTTONS via
FrmGetGroupSelection.. (or something like that, I don't have manual here)
it returns Byte with item number of the button ('INDEX in group').

How to connect that 'index' with button's ID (name)?!

 I mean, I managed to get these indices via debugger, but they seem to be
numbers that cannot be determined from resources. On one form with just 3
push buttons indices were 3,4,5, while on another they were 23,24,25.
I cannot figure out the 'key'.