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ButtonName.Click;					

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uses Qt;

procedure SimulateClick(Ctrl: TWidgetControl);
var
  ev: QEventH;
  p: TPoint;
begin
  p := Point(0, 0);
  ev := QMouseEvent_create(QEventType_MouseButtonPress, @p, 1, 0);
  QObject_event(Button1.Handle, ev);
  QEvent_destroy(ev);
  ev := QMouseEvent_create(QEventType_MouseButtonRelease, @p, 1, 0);
  QObject_event(Button1.Handle, ev);
  QEvent_destroy(ev);
end;