Disable fields based on value selected from first list box.

Hi All,
I am facing a problem in module pool programing. My scenario is there will be around 50 fields in the screen , within that first field is a drop down list box. In the list box there will be electricuty , gas and csw. If user select gas then the fields corresponding to gas will only be editable other fields not relevent to gas will be non editable(Disable).... Same case for electriciy andcsw also.
Can any one guide me regarding this....
Thanks in advance.
Regards
Ajoy

Hi Asaha,
This link will be of great help for you if you are new to Module pool.
[Module Pool Notes|http://wiki.sdn.sap.com/wiki/display/Snippets/ModulePoolNotes]
For [DYNP_VALUES_READ|http://wiki.sdn.sap.com/wiki/display/ABAP/FilteringF4HelpvaluesinTablecontrol,basedonotherfield+value] refer this link.
For [DYNP_VALUE_UPDATE|http://wiki.sdn.sap.com/wiki/display/ABAP/GettingainputfieldpopulatedonenteringthevalueinoneInputfield]
Regards
Abhii

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