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 Managing Trees  (Linked-Lists data structures)
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 Creating a tree          TREE [<oTree>] ;
                             [ BITMAPS <cBmpOpen>, <cBmpClose> ]

                             TREEITEM [<oItem> PROMPT ] <cLabel> ;
                                [ RESOURCE <cResName1> [, <cResName2> ] ] ;
                                [ FILENAME <cBmpOpen> [, <cBmpClose> ] ] ;
                                [ OPENED | OPEN ]

                             ...

                             [ TREE <oSubTree> ]
                                [ TREEITEM ... ]
                                [ ... ]
                             [ ENDTREE ]

                          ENDTREE

 <oTree>                  A reference to the TTree object just created.

 <cBmpOpen>               Optional bitmaps files or resources names for
 <cBmpClosed>             the tree nodes open and close states images.

 <oItem>                  A reference to the TTreeItem object just created.

 <cLabel>                 The prompt of an TreeItem element.

 <cResName1>              Optional bitmaps resources names for the item
 <cResName2>              open and closed states images. The Tree
                          <cBmpOpen> and <cBmpClosed> are used by default
                          if <cResName1> and <cResName2> are not specified.

 <cBmpOpen>               Optional bitmaps file names for the item
 <cBmpClosed>             open and closed states images. The Tree
                          <cBmpOpen> and <cBmpClosed> are used by default
                          if <cResName1> and <cResName2> are not specified.

 <oSubTree>               A reference to the TTree object just created.