ALV: Change of Cellstyle after SET_TABLE_FOR_FIRST_DISPLAY

Hi ABAPers!
I'd like to change the cellstyle of an ALV Grid after the method SET_TABLE_FOR_FIRST_DISPLAY was processed.
Depending on the value entered in one field, I want to change another field in the same row to make it editable or not. I react on the event DATA_CHANGED. Within the routine on this event I call the methods MODIFY_CELL followed by REFRESH_TABLE_DISPLAY, but the style of the appropriate field is not changed.
My coding is like this:
MyStyleTabWA-style = cl_gui_alv_grid=>mc_style_disabled.
MODIFY TABLE MyStyleTab FROM MyStyleTabWA.
er_data_changed->modify_cell(
 EXPORTING i_row_id = GoodCells-row_id
 i_fieldname = 'CELLSTYLE'
 i_value = MyStyleTab ).
MyGrid->refresh_table_display( i_soft_refresh = 'X' ).
The content of my personal cellstyle table seems to be ok. But the cell does never change to a uneditable mode.
Does anybody know what's going wrong?
Regards
Torsten

Hi Ravi!
Yes, it has.
I found a mistake in my field catalogue, where I named my cellstyle table different to the name in my data table. After correcting this, my application runs a little better, but not right.
Having an event DATA_CHANGED I alter the values of my cellstyle table. I REFRESH_TABLE_DISPLAY, but nothing happend. But it is changing, when I process PAI or the event DATA_CHANGED is fired a second time.
A refreshing problem? I do use CL_GUI_CFW=>FLUSH( ).
Any suggestions?
Regards
Torsten

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