ALV GRID - How to activate the option "Display graphic" ?

Hello,

I'm using

CREATE OBJECT r_container

EXPORTING

container_name = 'CONTAINER'.

CREATE OBJECT r_grid

EXPORTING

i_parent = r_container

• Create Event Receiver

CREATE OBJECT cl_event_receiver.

*

• Populate Field Catalog

PERFORM get_fieldcatalog.

*

r_grid->set_table_for_first_display(

CHANGING

it_outtab = it_table

it_fieldcatalog = it_fieldcat[] ).

and, as you can see I'm display it_table specifing the field of the table (I'm not usinf dictionnary reference ).

My problem is:

all run perfectly except the button "Display graphic" ( the graphic is showed but is empty).

How to solve it ?

tks.