>the problem is that I ignore the event of the grid in which I should refresh the texts in another area in the form
In the procedure to delete the record, I would add the code to do the refreshing. I don't recommend to delete a record just by clicking on the little rectangle to the left - that doesn't give you too much control. You should disable that, and have a separate button, or menu command, for deleting records.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)