Вызывается при нажатии на кнопку мыши.
Язык Описание VBScript, JavaScript SubMouseDown(aButton, aShift, aX, aY) Visual Basic Sub MouseDown(ByVal aButton As TIngeoMouseButton, ByVal aShift As TIngeoShiftState, ByVal aX As Long, ByVal aY As Long) Delphi procedure MouseDown(aButton: TIngeoMouseButton; aShift: TIngeoShiftState; aX: Longint; aY: Longint); C, C++ HRESULT MouseDown(TIngeoMouseButton aButton, TIngeoShiftState aShift, long aX, long aY); 
sub MapEditors_MouseDown(aButton, aShift, aX, aY)
  if aButton = inmbLeft then
    if aShift = (inssShift and inssAlt) then
       MsgBox "Точка (" & aX & ", " & aY & ")."
    end if
  end if
end sub