Help with a binary search tree with an expected output.

I am trying to print in order, print in pre order and print in post order. Any help with this will be appreciated. I have included a zip file of the code that I have so far. Thanks in advance for your help. The expected output is:

 

Building the tree with root value 50

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Insert 26 to left of node 50

Insert 15 to left of node 26

Insert 32 to right of node 26

Insert 78 to right of node 50

 

Traversing the tree in order

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Traversed 15

Traversed 26

Traversed 32

Traversed 50

Traversed 78

 

Traversing the tree in preorder

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Traversed 50 

Traversed 26

Traversed 15

Traversed 32

Traversed 78

 

Traversing the tree in postorder

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Traversed 15

Traversed 32

Traversed 26

Traversed 78

Traversed 50