Forms :: Get Block Name From Cursor Focus Location?

I have a delete button at the bottom of the form and have two blocks on top of it. I need to know which block i have the focus on or selected the record on pressing the delete button so that I go to that block and do a delete_record from that block. I came across :system.trigger_block which says it gives the name of the block where the cursor was located when the current trigger initially fired. But whenever i use it only returns the name of the block the delete button is located in. Instead i wanted to know where the focus of the cursor was or which record was selected in the above 2 blocks to go to that block and delete the record.