code: public static void setBusStopNoHaltBindingDrawable(Boolean isDrawable) {
  		final Preferences prefs = Preferences.userNodeForPackage(BusLayerConstants.class);
  		if (prefs != null) {
  			if (isDrawable == null) {
  				prefs.remove("DRAW_NO_BUS_HALT_BIND"); //$NON-NLS-1$
  			} else {
  				prefs.putBoolean("DRAW_NO_BUS_HALT_BIND", isDrawable.booleanValue()); //$NON-NLS-1$
  			}
  			try {
  				prefs.sync();
  			} catch (BackingStoreException exception) {
  				//
  			}
  		}
  	}
docs: Set if the bus stops stops with no binding to bus halt
  should be drawn or not.
  
  @param isDrawable is <code>true</code> if the bus stops name with no binding are drawable;
  <code>false</code> if the bus stops name with no binding are not drawable; or <code>null</code>
  if the default value must be restored.