Screen Field Color in Module pool

Hi Experts,
                  I have a requirement like based on the field content i want to change the color to the screen field. I have written code like below. But i'm getting dump.
        LOOP AT SCREEN.
          IF screen-group1 = 'G02'.
            screen-color = 'C411'.   -
> Getting dump here
            MODIFY SCREEN.
          ENDIF.
        ENDLOOP.
Please tell me whether it is possible to give color in module pool or not.
Thanks and Regards,
nag.

Hi Sam,
             Thanks for ur reply. I have tried using only integers.But i'm not getting color. My code is below
        LOOP AT SCREEN.
          IF screen-group1 = 'G02'.
            screen-color = '411'.
            MODIFY SCREEN.
          ENDIF.
        ENDLOOP.
color is INT4 type rite but we are passing only 3 characters to screen-color.But i didn't color to my field.

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Moderator message: please do more research before asking, try solving problems yourself first, look for previous discussions of similar issues, post texts in more readable format, you have been warned several times before.
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hi all
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see this link for better understanding of dialog programming/module pool programming.
http://help.sap.com/saphelp_nw04/helpdata/en/9f/db9ce935c111d1829f0000e829fbfe/content.htm
see this
Check the below link:
http://wiki.ittoolbox.com/index.php/FAQ:What_is_module_pool_program_in_abap%3F
http://help.sap.com/saphelp_46c/helpdata/en/35/26b1aaafab52b9e10000009b38f974/content.htm
http://sap.mis.cmich.edu/sap-abap/abap09/sld011.htm
http://sap.mis.cmich.edu/sap-abap/abap09/index.htm
http://www.geocities.com/ZSAPcHAT
http://www.allsaplinks.com/files/using_table_in_screen.pdf
http://help.sap.com/saphelp_webas630/helpdata/en/9f/db9cdc35c111d1829f0000e829fbfe/content.htm
http://www.sapdevelopment.co.uk/dialog/dialoghome.htm
http://www.sap-img.com/
http://help.sap.com/saphelp_46c/helpdata/en/08/bef2dadb5311d1ad10080009b0fb56/content.htm
http://www.sapgenie.com/links/abap.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c9/5472fc787f11d194c90000e8353423/frameset.htm
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Also you can see the below examples...
Go to se38 and give demodynpro and press F4.
YOu will get a list of demo module pool programs.
One more T-Code is ABAPDOCU.
YOu can find more examples there.
See the prgrams:
DEMO_DYNPRO_TABLE_CONTROL_1 Table Control with LOOP Statement
DEMO_DYNPRO_TABLE_CONTROL_2 Table Control with LOOP AT ITAB
http://www.geocities.com/ZSAPcHAT
http://www.allsaplinks.com/files/using_table_in_screen.pdf
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