TBN_QUERYINSERT


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TBN_QUERYINSERT
TBN_QUERYINSERT 
    lpnmtb = (LPNMTOOLBAR) lParam; 
Notifies the toolbar's parent window whether a button may be inserted to the left of the specified button while the user is customizing a toolbar. This message is sent in the form of a WM_NOTIFY message.
Returns TRUE to allow a button to be inserted in front of the given button, or FALSE to prevent the button from being inserted.

lpnmtb
Address of an NMTOOLBAR structure. The iItem member contains the zero-based index of the button to be inserted.

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