Gets the prototype node for the specified level.
A tree map starts with the root node. The root node contains level 1 child nodes. The level 1 child nodes can in turn contain level 2 child nodes, and so on.
A prototype node is a node that acts as the template for nodes at a certain level. For example, if the level 1 prototype node is configured to use a certain font for labels, all level 1 nodes will use that font as the default for labels.
A
TreeMapNode object representing the prototype node for the specified level.
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