Custom Lookup - 'group by' doesnt work

ALL,

During on of my project task i was trying for 'group by' on a lookup but strange it works for the first shot when i expanded the lookup and selected any value.
But unfortunately when i tried changing the lookup to some other value again all the values shown up in the lookup and grouping was no more active.

I was really puzzled with all options i was aware of but after further on the 'sysTableLookup' methods, found one method which helps finally.

sysTableLookup.parmUseLookupValue(false); - this should be passed as FALSE.

Hope it helps some of you.


Thanks,