Variable column header in table control

Hi all, I need a variable column header text in table control. I am doing the following but is not working,
I have deleted the header field that the wizard created me thorugh a internal table, and put a I/O field instead.
I have assigned a variable in the name of this field.
In the PBO I am writing the following:
LOOP AT   i_details
       WITH CONTROL tc_detail
       CURSOR tc_detail-current_line.
    MODULE m_modify.
ENDLOOP.
MODULE m_modify OUTPUT.
IF tc_detail-current_line EQ '1'.
    var1(header column text) = 'text1'.
    var2(header column text) = 'text2'.
ENDIF.
ENDMODULE.
But with this is not working, the rare thing is that the first time that the screen is shown, this value is not appearing. After press Enter or some action, the value appears.
I am not doing anything in PAI. The only code that is in PAI is:
Loop at i_details.
endloop.
Nothing more.

Hi,
First just drag and drop all the fields that are to be a part of the table control. Then drag the label on the column header. Give name and text to the label.
Regards,
Nikhil

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how to mentain the column header in table control,
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First just drag and drop all the fields that are to be a part of the table control. Then drag the label on the column header. Give name and text to the label.
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*& Report YFEB2_SCREEN_TBL                                            *
REPORT YFEB2_SCREEN_TBL                                            .
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Variable column header in table control

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