protected override void OnMouseWheel(MouseWheelEventArgs e)
{
if (browser != null)
{
var point = e.GetPosition(this);
var modifiers = e.GetModifiers();
browser.SendMouseWheelEvent(
(int)point.X,
(int)point.Y,
deltaX: 0,
deltaY: e.Delta,
modifiers: modifiers);
}
}