How to get Item level Guid in custom created tab in SRM7.

Hi Experts,

I have created a custom tab in item level for contract.

I am able to get the header guid using task container or fpm factory in the new zcomponent.

But I have to get the item level guid for the selected line item so how to get it.

How and where to pass the item guid so that that can be found in the zcomponent.

Thanks & Regards,

Partha