Description: Proficiency in the use of the Treeview control, using the spanning tree, at the same time to preserve the node, and then save it to list its empty, click back significantly after the re-select them.
File list (Check if you may need any files):
demo
....\Project1.cfg
....\Project1.dof
....\Project1.dpr
....\Project1.exe
....\Project1.res
....\Unit1.dcu
....\Unit1.ddp
....\Unit1.dfm
....\Unit1.pas
....\Unit1.~ddp
....\Unit1.~dfm
....\Unit1.~pas
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