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 Class TTreeItem    Trees TreeItems in FiveWin.
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   See Class TLinkList and xBase TREE ... ENDTREE command
   for an explanation of Trees under FiveWin.

 DATAs
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 cDraw           Contains the draw characters for this item.
 cPrompt         Contains the associated text label of the item.
 oPrev           Reference to previous TreeItem object.
 oNext           Reference to next TreeItem object.
 oTree           Reference to a contained tree object.
 lOpened         If the contained tree object is opened or not.
 nLevel          Ident level of the item.
 hBmpOpen        Handle of the bitmap for opened state.
 hBmpClose       Handle of the bitmap for closed state.

 METHODs
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 New             Constructor from source code
 End             Ends control and make it disappear
 Add             Adds a new following item.
 Close           Closes the the treeitem.
 ColSizes        Returns an array with colsizes to use for painting the browse row.
 Delete          Deletes treeitem.
 Draw            Draws the item.
 GetLabel        Retrieves the treeitem label.
 GetNext         Retrieves the next treeitem.
 GetPrev         Retrieves the previus treeitem.
 GetText         Retrieves the treeitem prompt.
 Open            Opens the optional tree contained by the TreeItem.
 SetNext         Set a new value for the next treeitem.
 SetText         Set a new prompt for the current treeitem.
 Skip            Goes to the next treeitem.
 Toggle          Change the treeitem status if it's open closes it, else opens it.