[Qt-interest] QListView's Bar can't drag up, if I set a styleSheet for it?

[Kermit Mei]

Hello, community!

I'm programming on ARM9 with Qt4.3.0. I used some ListView, but I found
that if I set some styleSheet, the Listview's scroll bar can't drag from
down to up, whereas it can just allowed me to drag from up to down.

What may cause it? How can I solve it?


Thanks.

Kermit Mei