public ActivityTreeNode (Activity _activity)
public ActivityTreeNode (Activity _activity, DefaultTreeModel _model)
	public ActivityTreeNode (Activity _activity)	{		super() ;		this.activity = _activity ;		this.setUserObject(activity.getDescriptor().getName()) ;				// Displaying associated tasks		Collection <BreakdownElement> localNested = activity.getNestedElements() ;		BreakdownElement localElement ;		Iterator <BreakdownElement> localIterator = localNested.iterator() ;		while (localIterator.hasNext())		{			localElement = localIterator.next() ;			if (localElement instanceof TaskDescriptor)			{				this.add(new TaskDescriptorTreeNode((TaskDescriptor) localElement)) ;			}		}	}