How can delete a record in a master-detail relation

Hi to All,

I have created a Form with 3 Blocks:
1) MASTERBLOCK, Table1, PK MASTER_CODE
2) DETAILBLOCK, Table2, KEY = DETAIL_CODE
3) TOOLBAR with button SAVE, ADD, DELETE etc...

All Work fine! I can Add, Modify, Save all in the Master and in Detail
Block.

But If I try to Delete a Master Record, this message is displayed:

CANNOT DELETE THE MASTER RECORD IF THERE ARE CORRESPONDING DETAIL
RECORDS (NB. I have translated the message from italian language)

In the trigger WHEN-BUTTON-PRESSED of DELETE Button I have entered:

Delete_Record ;

Please can anyone help me in order to delete the master and the detail
records?

Thank You and Best Regards
Gaetano