Save Dialog whitespace image

[satukoro]

I am trying to find out how to change the white background in the save dialog. Image can be found here: http://fc09.deviantart.com/fs48/f/2009/210/7/1/Save_Dialog_whitespace_by_Satukoro.png

[Spitzen]

Fonts, Colors & System Metrics > Fonts & System Metrics: BTNFACE:COLOR
At least it is there in 7

[rajtheeban]

I use Vista, and it seems it depend of your shellstyle, for some taskdialog maybe