WPF Treegrid control

Hi,

Could any one point to some links where i can get this in WPF. The example should not have any copyright.

A tree view grid control in (which there are columns) and heirarchy
   1.   Each cell could be either read only or editable
   2.   Filtering possible on the tree control
   3.   Some cells it is required to have a combo box to show multiple values.
   4    Sorting
        



Thanks and
Rgds/Pramod