compref
Use fragments for inline panels..
A fragment is like a panel, but can be 'inlined',
meaning it does not need it's own markup file, but
can be defined in the markup file of another. For this
example, we use the parent's markup file as the host,
and we do not explicitly tell the fragment which host
to use.
Like panels, fragments can contain arbitrairy components,
like this label: yep, this is from a component proper, or
even another panel:
Contents of another panel.
.
<wicket:fragment wicket:id="fragmentid">...</wicket:fragment>
private class MyFragment extends Fragment {
...
add(new MyFragment("fragment", "fragmentid"));