SysTabControl32 and Background image

[Gintaras]

I tested static bitmap control, it does not hide SysTabControl32 if it is below in Z order.

hides:
6 Static 0x5400000E 0x0 4 40 252 112 ""
3 SysTabControl32 0x54000040 0x0 16 8 232 120 ""

does not:
3 SysTabControl32 0x54000040 0x0 16 8 232 120 ""
6 Static 0x5400000E 0x0 4 40 252 112 ""