A TreeList node's structure.
The node's data object.
Indicates whether the node has child nodes.
The node's key.
The node's hierarchical level.
The level of the root node is -1. This node is not visualized and is used to access the full hierarchy of nodes. The root node's children have level 0, the children's children have level 1, and so forth.
The parent node.
Indicates whether the node is visualized as a row.
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