Dropdownlist Select From Parent

i have 3 levels of dropdownlist

i have to select first the behavior type [negative, positive)
based on the type, i have to select the behavior group and finally the behavior

i am beginner in yii and ajax, i got an example from the internet and i tried to apply it to yii

the example didn't work in yii, but it's workable in pure php

can anyone tell me where is the error.

thanks in advance
 _formcreate.php (2.96K)
: 1  dd.php (581bytes)
: 2  dd2.php (293bytes)
: 1