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The isLeaf property is meant only for dynamic trees, not for static ones, where it is meaningless. In dynamically loaded trees, TreeView assumes that all nodes can be expanded and adds a plus sign to every node, assuming that it can be expanded into more nodes. Since the child nodes are to be loaded dynamically at some point, it is the most useful guess since it allows the visitor to keep diving into the branches and, at any rate, as part of the dynamic loading, the server might report that there are no further children that way.

However, when the child nodes are dynamically loaded, you can signal TreeView that a node is a leaf so no plus sign is placed in front of it and precluding any further diving into it.

Thus, isLeaf might be considered a write-only property to signal that a dynamically loaded node will have no children, it does not report on statically loaded nodes.

To find out about statically loaded nodes, check the length of the array of its children.