C++ dll works in IE6 but not in IE8

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VisualC++

When a mouse move is done on IE6 the corresponding Hook message (WH_CBT), call back function (CBTProc) is called with first argument ncode as 3 (HCBT_CREATEWND) and this works fine. In case of IE8 when mouse move is done Hook message (WH_CBT) call back function, (CBTProc) is called with first argument ncode as 6 (HCBT_CLICKSKIPPED)

Please tell me what I should change to make it work as in IE6 or why in IE8 different code is sent as argument. Please someone reply ASAP.