anchor.diff:  [TIP]
   ====
   Use the getControl() method on a Spatial to get a specific Control object, and activate its behaviour!
  -====
   
   [source,java]
   ----
   ManualControl c = mySpatial.getControl(ManualControl.class);
   c.steerX(steerX);
   ----
  +====
  
positive.code: public class ManualVehicleControl   extends ManualControl {...}
  ----
  
   and
  
  [source,java]
  ----
  
negative.code: 
  Usage example:
  
  . Create a custom control interface.
  +
  [source,java]
  ----
  