| Interface | Description | 
|---|---|
| LazyParent<T> | 
 A LazyParent provides the mechanism for lazy retrieval of children of a node in a tree i.e Children are retrieved at time of first expansion of the parent node. 
 | 
| Class | Description | 
|---|---|
| LazyParentNode | 
 A LazyParentNode is a type of DefaultMutableTreeNode that doesn't compute its children until the user attempts to expand the node. 
 | 
| LazyProgressController | 
 A mechanism to track and control the lazy loading of tree nodes. 
 | 
| LazyProgressNode<T> | 
 A LazyProgressNode is a temporary node that appears in a tree as a child of a LazyParentNode. 
 |