The TreeNode class represents a single data item in a Tree object. Each TreeNode consists of a text label, and optionally a pair of bitmap labels. The bitmap labels appear to the left side of the text label. They can be used in one of two ways:

A TreeNode that has child nodes is referred to as a parent node. Child nodes, when displayed within a TreeviewField, are indented below their parent node. A node can also have sibling nodes that are all indented at a same distance.

You can use the ClientData attribute (see ClientData Attribute) inherited from the Object class to associate application-specific data to each node.