The VMPanel does not properly handle the MBeansTab update on
reconnection when the JMXConnectorServer uses an MBeanServer
different from the PlatformMBeanServer.

VMPanel.update() calls MBeansTab.update(), more precisely
tabs.get(4).update(), on the first connection but never
again. This means that if in between a disconnect/reconnect
some MBeans are added/removed the MBean tree will not reflect
the changes.