Container in Grid

[Kent]

I have problem with displaying. Axapta tray display it as image and I got an error. That is the problem.
I have code: I collect data from ListView and insert it in container, and container I post in table. 'Field' have extended data type "Container".

    container    con;
    Set          set = new Set(Types::String);
    ;

    idx = ListSelected.getNextItem(FormListNext::All);
    while (idx != -1)
    {
        item = ListSelected.getItem(idx);
        set.add(item.data());
        idx = ListSelected.getNextItem(FormListNext::All, idx);
    }
    con = [set.pack()];
    table.Field= con;
    table.insert();

After this, in table in container field I got this result: The question is - how to display this in Grid ?