WPF MVVM Treeview selected item

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WPF

I am using wpf treeview control in MVVM concept which has dataset as a datacontext and using hierarichal data templates to display data in tree view.

Now problem is sometimes, i want to set the selected item of a treeview.
means as i am using dataset, so i need to set Datarow view as a selected item of a treeview.

Please help me out in MVVM model how can i do it


<treeview name="contentTreeView" grid.row="1" datacontext="{Binding TreeDS, Mode=TwoWay}" itemssource="{Binding CustomerMaster}" itemtemplate="{StaticResource CustomerTemplate}" selecteditemchanged="contentTreeView_SelectedItemChanged">