JTable gridlines not showing in a nimbus L&F

my JTable has a rendered background with an image into it.. in a default L&F i dont see any problems, but changing it into a nimbus L&F, makes every thing worst, how can i enable the grid lines in a Jtable using a nimbus look and feel?

by the way, event if i remove the image background the grid lines still dont show...


i tried to implement this codes

Code :

---

UIManager.put("Table.gridColor", Color.RED);
UIManager.put("Table.disabled", false);

---

but nothing happens


please I need help.. well another follow up question if this case doesnt have any solutions..

the whole problem is i want to change a single component's look and feelm but not affecting other components is this possible? the whole frame has default L&F, while my scrollPane will be nimbus... is this possible?:confused::o