Unable to catch Chevron notification on IE Toolbar

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C++

ATL

COM

Hi,

I have created IE toolbar using ATL COM, which was posted in CodeProject at Internet Explorer Toolbar (Deskband) Tutorial[^]. I am not using MFC,WTL. I have created toolbar using ATL COM, Win32 and am very new to COM programming. I have enabled Chevron by adding flag DBIMF_USECHEVRON in DESKBANDINFO structure.

pdbi->dwModeFlags = DBIMF_BKCOLOR |DBIMF_VARIABLEHEIGHT | DBIMF_USECHEVRON | DBIMF_BREAK ;

Chevron is getting created when I resize my IE toolbar below the Actual size given in pdbi->ptActual.x = 600; and it is listing all the toolbar buttons which are hidden as a list. But I am not able to do anything with the buttons that are listed. Even I am not able to catch this message:

NOTIFY_CODE_HANDLER(RBN_CHEVRONPUSHED, OnChevronPushed

Please help to catch the chevron so that I can handle my toolbar buttons. Thanks in advance.