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