void Mouse_WheelChanged(object sender, OpenTK.Input.MouseWheelEventArgs e)
{
foreach (MouseEventHandler h in mouseEventHandlers)
{
MouseWheelEventArgs args = new MouseWheelEventArgs();
args.SetDelta(e.Delta);
args.SetDeltaPrecise(e.DeltaPrecise);
h.OnMouseWheel(args);
}
}