ListBox Recursive Grouping

Question

Hello,

I have data in a Sql Server database that i have to load in a listbox control.This is done, but now i was asked to group these data as data shown in a Gantt Diagram

This the structure of my table



CodeDossier--------CodeParent(Parent Code)--------Niveau(Level)--------Libellé(Label)

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

A------------------------Null-----------------------------------1------------------------Label 1--------

A01----------------------A-------------------------------------2------------------------Label 2--------

A02----------------------A-------------------------------------2------------------------Label 3--------

A021-------------------A02-----------------------------------3------------------------Label 31--------

A022-------------------A02-----------------------------------3------------------------Label 32--------

B------------------------Null-----------------------------------1------------------------Label 4--------

B01---------------------B--------------------------------------2------------------------Label 5--------

B02---------------------B--------------------------------------2------------------------Label 6--------

B03---------------------B--------------------------------------2------------------------Label 7--------

C-----------------------Null------------------------------------1------------------------Label 8--------

C01---------------------C--------------------------------------2------------------------Label 9--------



and i have to present these data in the listbox like this:

CodeDossier     Lib

+A                      Label 1 (4)

          -A01         Label 2

         +A02        Label 3

                -A021                Label 31

                -A022                Label 32

+B                                      Label 4

         +B01         Label 5

         +B02         Label 6

         +B03         Label 7

+C

        +C01 Label 8







i spent three days on it but unfortunately i could'nt find solution for it.my director want that i do it in xaml. Hope that someone could help me. Thank