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How to create an object (line, arrow, text, etc.) based on user action, after the graph was built?

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How to create an object (line, arrow, text, etc.) based on user action, after the graph was built?

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Objects cannot be actually added after the graph is built. The way around this is to create some extra dummy objects and make them invisible (WGShowObject). When needed, position them correctly (WGChangeObjectCoord) and make them visible.

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