Над какой закладкой курсор в TabControl?

Code:

function Form1.ItemAtPos(TabControlHandle : HWND; X, Y : Integer) : Integer;

var

HitTestInfo : TTCHitTestInfo;

HitIndex : Integer;

begin

HitTestInfo.pt.x := X;

HitTestInfo.pt.y := Y;

HitTestInfo.flags := 0;

HitIndex := SendMessage(TabControlHandle, TCM_HITTEST, 0, Longint(@HitTestInfo));

Result := HitIndex;

end;