if (currentGroupNode == null) throw new IllegalStateException("Why?");
currentGroup.incrementMemberCount();
	    private void insertIntoGroup(BugInstance member) {		if (currentGroupNode == null)		    throw new IllegalStateException("Why?");		DefaultMutableTreeNode bugNode = new DefaultMutableTreeNode(member);		bugTreeModel.insertNodeInto(bugNode, currentGroupNode, currentGroupNode.getChildCount());		// Insert annotations		Iterator j = member.annotationIterator();		while (j.hasNext()) {		    BugAnnotation annotation = (BugAnnotation) j.next();		    DefaultMutableTreeNode annotationNode = new DefaultMutableTreeNode(annotation);		    bugTreeModel.insertNodeInto(annotationNode, bugNode,  bugNode.getChildCount());		}			    }