How to delete themes from 8520 ?

[Insiya]

I am trying to delete themes from my blackberry 8520 but nothing seems to work. I tried clicking on the theme and then clicking on menu but i don't get a delete option. then i tried deleting from applications in advanced options. i got the message saying its deleted successfully but when i checked in my installed themes those themes were still there. I even tried to delete using my desktop manager but those themes were not shown in my remove applications list. I switched off and then turned on my cell still no luck. :frusty:Am i the only one having this problem or is there any other solution for deleting themes from 8520 ?

Please Help !!