public void OnMouseDown(MouseEvent e)
{
Point position = new Point(e.PageX, e.PageY);
MouseButton button = converter.ConvertBackMouseButton(e.Button);
mouseDownHandled = ProcessMouseEvent(new RawMouseButtonEventArgs(button, MouseButtonState.Pressed, position, GetTimestamp()));
if (mouseDownHandled || MouseDevice.CaptureTarget != null)
{
e.PreventDefault();
}
}