An extension of our TFixSelCustomGrid to display an abstract tree.Supports operations on a tree, nodes expanding/collapsing, etc.Allows many tree item attributes. Allows such special tree operations as Sorting, Filtering and Summation.Combined with supplied classes to manage tree and its nodes gives an ability to have both quick and suitable tree of any objectsFeatures:Displaying a tree with nodes state (expanded/collapsed) and ability to changed their state Items Sorting and Filtering Summarize data from leafs to parents Focusing of the fixed columns/rows Very suitable in-place editing with ability to edit/display RTF text and detect URLs. (See TFixSelCustomGrid) Optional Marking column