code: @Override
      public void setCustomProperty(String propertyName, String propertyValue) {
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.entry(tc, "setCustomProperty", new Object[] { propertyName,
                                                                 propertyValue });
  
          _customProperties.setProperty(propertyName, propertyValue);
  
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.exit(tc, "setCustomProperty");
      }
docs: setCustomProperty is implemented from the interface JsEngineComponent and
  is used to set properties on the MP
  
  @param propertyName
  The name of the Attribute
  @param propertyValue
  The value of the Attribute
  
  @see com.ibm.ws.sib.admin.JsEngineComponent.setCustomProperty