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I was having hard time getting CDDS_POSTERASE to fire, neither was I getting CDDS_POSTPAINT.
I realized that to get CDDS_POSTPAINT you have to specify CDRF_NOTIFYPOSTPAINT in CDDS_PREPAINT stage,...

Custom draw worked for me.
Here is my code.

m_toolbar1.CreateEx(this, TBSTYLE_FLAT | TBSTYLE_CUSTOMERASE, WS_CHILD | WS_VISIBLE | CBRS_ALIGN_TOP, CRect(10,10,100,100), AFX_IDW_TOOLBAR);...