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Occurs when a node is added to the graph.
Use the OnAddNode event when you want to do something every time a node is added to the graph.
Occurs when the Caption property for a node is about to change.
Write an OnNodeCaptionChange event handler to take some action when the caption is about to change.
Occurs when the node changes (edges are added or removed, weight is changed, etc).
Write an OnNodeChange event handler when you want to take some action when the node changes.
Occurs when a node is removed (extracted or deleted) from the graph.
Use the OnRemoveNode event when you want to do something every time a node is removed from the graph.
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