Combo box suggestion help

[Pusher]

How to make a combo box B fill with the content of combo box A (like a suggestion) but if you want to changed the combo box A you can.
1 combo box A is TEXT and B is TEXT. Also I have 3 Combo boxes with short time that if want to fill like this, the first combo box is filing the content of the second and third.

 

[jdraw]

see this free video tutorial
http://www.datapigtechnologies.com/flashfiles/combobox2.html

The subject for Google-ing is Cascading combo boxes

 

[Pusher]

I don't want cascading combo boxes - i just want a simple filling of the box
Like if in many cases 2 combo boxes are the same but in fewer cases i have to enter a different value for that 2 combo boxes so I want to make it easier and faster to enter these information.
One (main) Combo box is named ID_STANJA_PRIJAVE and the other is named ID_ZATECENO_STANJE