Call F4 key method ??

hi all ,
When I click search help button in my dynamic alv , I want to open modal diyalog box for help .
gs_fcat-col_pos   = mon + 5.
    gs_fcat-fieldname = lv_field.
    gs_fcat-ref_table = '/DTY/_DNDMM_ATZH'.
    gs_fcat-ref_field = 'ATZHL' .
    gs_fcat-F4AVAILABL = 'X'. " My search help
    APPEND gs_fcat TO lt_fieldcat.
How Can find my search help sy-ucomm . or
What is metod ??
Thanks Reply .
Serkann
Edited by: Serkann Taskann on Nov 3, 2008 4:16 PM

Hi,
The F1 and F4 events of the SAP textedit are registered using the SET_REGISTERED_EVENTS method to ensure that they are passed to the application server when they occur. F1 is defined as a system event, F4 as an application event.
Where f4 event will act as input help.
Cheers!!
VEnk@

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