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Set each course in a row according to its level Order vertically courses according to relations. Try to do not cross relation lines. Enable/Disable nodes according to the status of each course
Observations The existing approach is awkward because the add node buttons are placed in a toolbar away from the actual node being operated on. So the user needs to select a node, move the cursor to the toolbar, and then figure out what operation to select. The tree control is notoriously complex (multiple nodes, multiple levels of hierarchy). Therefore, ...
One option Checkout DP Reviews's forums for an example of a threaded structure coexisting with flat. Sometimes threads load flat, sometimes threaded. It's a bit of a mess, but they pull it off. They accomplish it with a simple "Flat View"/"Threaded view" link at the top of each discussion thread You'd think, and I suggest, that the forum would ...
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