rem: coords[0] = g_object_get_data ( item, "x" ); coords[1] = g_object_get_data ( item, "y" );
add: coords[0] = GPOINTER_TO_INT (g_object_get_data ( G_OBJECT (item), "x" )); coords[1] = GPOINTER_TO_INT (g_object_get_data ( G_OBJECT (item), "y" ));
context: gboolean gsb_gui_change_cell_content ( GtkWidget * item, gint number ){    gint coords[2];    coords[0] = g_object_get_data ( item, "x" );    coords[1] = g_object_get_data ( item, "y" );    tab_affichage_ope[coords[1]][coords[0]] = number + 1;        gtk_tree_model_foreach ( gsb_transactions_list_get_store (),			     gsb_gui_update_row_foreach, coords );    return FALSE;}