Slection screen of BDC

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hi folks,

For my BDC program, on the selection screen..there will be two radio buttons...one for uplaoding local file..and other for application server file..and there will be a parameter which holds the path file. if i click local file radio button and click the path file a pop up window should apper for browsing the file in PC...My problem is if i default the first radio button to 'x', then the window is opened for both the radio buttons. if i wont default it, the pop up window not appearing itself...here am giving my peice of code..pls suggest me..

PARAMETERS :R_Local radiobutton group rad1 default 'X' ,

R_Apps radiobutton group rad1 .

PARAMETERS :filename TYPE rlgrap-filename .

AT SELECTION-SCREEN ON VALUE-REQUEST FOR filename.

REFRESH: it_tab.

IF R_Local = 'X'.

CALL METHOD cl_gui_frontend_services=>file_open_dialog

EXPORTING

window_title = 'UPLOAD_FILE'

default_filename = ' '

multiselection = ' '

CHANGING

file_table = it_tab

rc = gd_subrc.

ELSEIF R_Apps = 'X'.

xxxx.

ENDIF.

Thanks.

Edited by: Ram K on Jun 27, 2008 10:38 AM