Restrict new record insert after query execute in data block

How can i restrict my data block to accept values in new row.

My seniro is that when i execute query in a data block user is allowed to change values is any text item but cannot add new record or even dont allow to go next_record if he is on
last_record.

Where should i put trigger and what trigger and code.
Waiting for ur +ve reply.

TIA
Raza

Just set the insert property of the block to 'NO'

programatically - SET_BLOCK_PROPERTY('blockname','INSERTABLE,PROPERTY_FALSE);