I found it for every victim the answer is simple
in the FormMouseWheelDown event write this
if (DBLookupComboBox1-> Focused () == true) DBLookupComboBox1-> Run (WM_KEYDOWN, VK_DOWN, 0);
and in FormMouseWheelUp write
if (DBLookupComboBox1-> Focused () == true) DBLookupComboBox1-> Run (WM_KEYDOWN, VK_UP, 0);
that is .. enjoy
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