At last I made it. I could color the entire area of the property sheet. I implemented it by using the following code:
newBrush1 = ::CreateSolidBrush(COLOR);
OldBrush = (HBRUSH)::SetClassLong(GetTabControl()->GetSafeHwnd(), GCL_HBRBACKGROUND, (LONG)newBrush1);
To change the background color of the tab, override the owner draw.