What is control form function module.

hi
what is control form function module.

Hi Chaitanya,
The function module CONTROL_FORM can  be used to pass the control
commands to FORM THROUGH ABAP/4 PROGRAM.
<b>Function Call</b>
CALL FUNCTION 'CONTROL_FORM'
EXPORTING COMMAND = ?...
EXCEPTIONS UNOPENED =
UNSTARTED =
<b>Export parameters:</b>
COMMAND
Enter the SAPscript statement you want to execute in ITF format, but without the statement paragraph attribute '/:'.
<b>Exceptions:</b>
UNOPENED
The current form function could not be executed, since the form output was no yet initialized using OPEN_FORM.
UNSTARTED
No form was opened yet.
Possible reasons:
>The form processing was started using OPEN_FORM without specifying a form name, but no form was opened yet using START_FORM.
>The last used form was closed using END_FORM, but no new form was opened using START_FORM.
>The last filled page of the current form has no subsequent page. In this case, the system automatically terminates form printing after this page. You need no explicit END_FORM call.
>In the current form, no page contains a main window, but a text element shall be output in the main window.
Regards,
Rajesh K Soman
<b>Please rewared points if found helpful.</b>

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    Syntax:
    CALL FUNCTION 'CONTROL_FORM'
      EXPORTING
        command         =
    EXCEPTIONS
      UNOPENED        = 1
      UNSTARTED       = 2
      OTHERS          = 3
    IF sy-subrc <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
    ENDIF.
    Example:
    Protecting the text element ITEM_LINE
    CALL FUNCTION 'CONTROL_FORM'
      EXPORTING
        COMMAND = 'PROTECT'.
    CALL FUNCTION 'WRITE_FORM'
      EXPORTING
        TEXELEMENT = 'ITEM_LINE'.
    CALL FUNCTION 'CONTROL_FORM'
      EXPORTING
        COMMAND = 'ENDPROTECT'.

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