Table maintenance, event when select from DDList or Toggle checkbox

Hi all,

I've created a custom table with a maintenance view and I wnat to implement some validations or clear some fields when the user selects a value from a drop down list or toggle a checkbox and I don't want the event to select (ENTER) the entry.

I've tried with function codes and user_command module but this opction select the entry on the table:

1. Function codes
   
   
   
   
2. USER_COMMAND Module
   
   
   
   
3. When toggle the checkbox the entry is selected (first entry):
   
   
   
   

My requirement is to implement something like this without selecting the entry (first row is grayed out as when the user press ENTER).

Is this requirement possible with table maintenance?

If so, how can I implement this?

Regards,

Gregory.