Initialize Value search help - Depending on Criteria

Hi ,

I have a Form UIBB  containing 2  Input fields assigned  with data dictionary value search help . Now depending on the Value  of the first field the value

search  help for the 2nd field need to be filtered . say For Example  2 Fields like  Country  & States  are added in the form GUIBB . Now which ever

country is  selected in the first  field its corresponding states need to be loaded in the search help of other field  .

My Issue is when the form is loaded none of the method like process event , get_definition or Get_data is triggered . The Value search help for all the

fields are initialized in the get_definition method when the form is loaded initially  for the first time .  

I am not sure which interface need to be added in the feeder class of my Form GUIBB .

Regards,

Vicky