IOS PSTreeGraphView , How to create two node One left side and one right side

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Hello sir,
after first node , i have to create right side and left side add one node . so i am confuse How can i do this . please give me solution . same question i have post on stackoverflow . http://stackoverflow.com/questions/40631912/ios-pstreegraphview-how-to-create-two-node-one-left-side-and-one-right-side
on this stackoverflow i have add images this easy to undastanding my problem.
plase share with me you valuable knowledge .