automatic tabbing at end of field in my dynpro

HI,

I want automatic tabbing at end of field for my dynpro field hours_start minutes_start hours_end minutes_end that are only of 2 char in dynpro.

E.g. i write 15102030 i want that automatically the dynpro field is

hours_start = 15

minutes_start = 10

hours_end = 20

minutes_end = 30

How can i move the cursor automatically when one of the field is completely filled?

I don't want set with ALT+F12 -> Option why I don't want change other programs.

Gustavo