functional category node 功用范畴节点
You can create, delete, or rename a child category; drag and drop the managed system node from physical panel to the logical view; and rename a managed system.
您可以创建、删除、重命名一个子类别；将托管系统节点从物理面板拖拽到逻辑面板；以及重命名一个托管系统。
The add node is under the math category of the standard visual snippets.
add 节点位于标准可视代码片段的数学类别下。
treeNodeExpand: Expand a particular node in the category tree.
treeNodeExpand：展开类别树中的特定节点。
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