Tree Control

The Tree control lets a user view hierarchical data arranged as an expandable tree.

For complete reference information, see the Adobe Flex Language Reference. For information on hierarchical data providers, see Hierarchical data objects.

For information on the following topics, which are often important for using advanced Tree controls, see:

How to format the information in each Tree node and control how users enter data in the nodes; see Using Item Renderers and Item Editors.
How to drag objects to and from the Tree control; see Using Drag and Drop.
About Tree controls
A Tree control is a hierarchical structure of branch and leaf nodes. Each item in a tree is called a node and can be either a leaf or a branch. A branch node can contain leaf or branch nodes, or can be empty (have no children). A leaf node is an end point in the tree.

By default, a leaf is represented by a text label beside a file icon and a branch is represented by a text label beside a folder icon with a disclosure triangle that a user can open to expose children.