il.lookup.InstanceContent InstanceContent }

is used as the content implementation. To add something to the lookup,
simply use
{@link org.openide.util.lookup.InstanceContent#add(java.lang.Object) add(Object) }

(and <code>remove(Object)</code> for the reverse). These may be called
at any time and will update the set of registered instances (firing
result changes as needed).

<pre>
    <span class="keyword">import</span> org.openide.util.lookup.*;
    <span class="type">InstanceContent</span> <span class="va