The DBTree structure of Delphi tree menu example source code, you can add nodes AutoNumber can delete the node classification and sub-node classification for better presentation and database with the instance has joined the Access database, I believe that through this instance, you use of DBTree will one step further.

lx\Lx\lx.cfg
..\..\lx.dof
..\..\lx.dpr
..\..\lx.res
..\..\test.mdb
..\..\Unit1.dcu
..\..\Unit1.ddp
..\..\Unit1.dfm
..\..\Unit1.pas
..\..\Unit2.dcu
..\..\Unit2.ddp
..\..\Unit2.dfm
..\..\Unit2.pas
..\Lx
lx

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