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Tree Graph with Add Buttons

How to create a tree graph with buttons for adding new members to each branch? What if the buttons are just JointJS elements? How would you configure the TreeLayoutView to prevent the user from dropping nodes after the add buttons? Take a look at the demo below.
Demo instructions
Use the plus icons to add more elements, or drag & drop existing elements to another position to change its parent.
Tree graph with add buttons

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Made with JointJS

Available in the JointJS open-source library which helps developers create simple visual applications in less time.

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