Silverlight ListBox Grouping

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I have problem while grouping in listbox. Actually my table structure is as follows. Emp_ID   EmpName  EmpParent_ID 1000002   Vivek   1000005 1000003   Rohit   1000005 1000005   Ajay    1000031 1000006   Sanjay  1000005 1000011   Hemant  -1 1000022   Amit    1000005 1000024   Aakash  1000006 1000027   Ameya   1000005 1000030   Ram     1000005 1000042   Arvind  -1 Now I want to group on EmpParent_ID. Output should be like this: Ajay   Vivek   Rohit   Sanjay   Amit   Ameya   Ram Sanjay   Aakash If this is not possible using ListBox then please suggest me another method to work it properly.