Delete a line automatically in a table-type form

Hi, I have a tabular-type form in which we insert inform in manual form. Sometimes people click ente enter or click your mouse and leaving under a blank line unreported. I'd like to know how I can prevent this. I guess I would need something like a control that deletes the line if one or more fields are not informet. Now, in OnQuerycloseform I have:

IF ("fieldndame" = '') THEN
DELETE;

This removes the lines that I've not informed, but it only do it if you are on the line, not any line . How I can do this?. Also I can think a kind of button to "insert" or something like that to prevent the pass line.
Thanks for help.