How to flush TDE graphic cache

Hi, I am currently re-working some TDE graphic items. Most of the time, these are in /opt/trinity/apps/(name_of_the app)/pics/ But for some of them (KPPP and some parts of TDE Control Center), I can change the picture, launch the app and I still see the old picture. Even after rebooting, the old picture is still there. So, is there a way to completely flush TDE graphic cache, without having to create a new ''user'' each time to try it? Thank you very much for your efforts on TDE! -Alexandre