CMFCToolBar changing Windows style

Hi everyone,
my application has two CMFCToolBars: the one above filled with icons, the other filled with a bmp. Changing Windows style (for example from Basic to Classic) the toolbar filled with the bitmap has empty buttons. I tried to create two toolbars filled by icons but I couldn't. My OS is Win7 but I have the same problem using XP.
Could anyone help me? Thanks a lot.

Alternatively, can you tell me which CFrameWnd event is triggered by changing style?

nobody?

I think when you switched to classic style, the toolbar will use 16x16 old bitmap color (16 bits).

When you switched to the high resolution, it will use 256 color style.