problem with first start after flashing

[1hxo]

Hello
I have a problem with the today background after flashing
i created a .tsk file(the tsk file is fully functional when i copy this in my documents and change this manual)
Then i delete all the orginal .tsk files out of my rom an put the new one into my rom(i read the tutorial)
when i flash my omnia and start it the colours are ok but the background is a picture that i found with the name grandprix_stwater and grandprix_tdywater
but i dont find some reg entrys with this name
when i change the theme to default and back to my theme it works
but how is it possible that after flashing with my rom the background shows my theme without switching to default and back?