Printing and QTableWidget

[Garfeild]

Hi all.
In my program i have table with information and grid. This table is member of QTableWidget. I need to print this table with grid. For it i used this solution. But after print i see black sheet with grid. What is wrong? My sources and printing example are attached.

[Garfeild]

Well, to see white sheet it's necessary to fill pixmap with "Qt:white" before printing. Thanks to blight_ from #qt in freenode.