}
item.setValidated(false);
}
// remove data
if ( ts instanceof CompositeTupleSet ) {
CompositeTupleSet cts = (CompositeTupleSet)ts;
for ( Iterator names = cts.setNames(); names.hasNext(); ) {
String name = (String)names.next();
String subgroup = PrefuseLib.getGroupName(group,name);
m_visual.remove(subgroup);
m_source.remove(subgroup);
}