MFC CComboBoxEx icon update issue

Question

I am using the CComboBoxEx control in MFC to implement an address box for a browser application which shows the address and the related site icon.

According this link:

Answer 1

I once encountered a similar problem. Later I found that the cause is the CImageList when I created it.

After I changed

m_pImgLst->Create(32,20,ILC_COLOR32,2,2);

to

m_pImgLst->Create(32,20,ILC_COLOR16,2,2); 

the phenomenon of updating until WM_KILLFOCUS received disappeared. But it's a pity that the image is a little less beautiful than before.