public void HandleKey(KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.ShiftKey:
ShiftDown = true;
break;
case Keys.Add:
MMessageBus.Rotate(this, new Quaterniond(0, 45 * Math.PI / 180.0, 0));
break;
case Keys.Subtract:
MMessageBus.Rotate(this, new Quaterniond(0, -45 * Math.PI / 180.0, 0));
break;
}
}