Event or way to check when a component has visibility change

[Brown, Berlin [GCG-PFS]]

With the 1.4 release of wicket, is there a way to determine when a
component has changed visibility.  Mainly from false to true visibility.
 
I can use onBeforeRender or onConfigure to determine when the component
is being rendered. 
 
onAfterRender will get called after it is rendered but the component is
still visible.