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Iam trying to develop a TreeView where the user can view the nodes singularly eg. if in a list he clicks on a particular node(Node 1), then only its childnodes shall be visible, the moment he clicks on another node(Node 2), that node's(Node 2's) childnodes would be visible, while the earlier node's(Node 1) childnodes would collapse automatically. My Questions are  :

i) Is it possible to do so by only using XAML(no code in VB to be written) ?

ii) If possible could you refer any articles/manuals/guidelines on the subject.

Go have a look at this article:  http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx

You can use the techniques here to accomplish what you need.

I'm assuming that you want to allow the user to drill down in the treeview and only close the others when a new root node is clicked, right?

You could also put multiple treeviews inside a ListBox and when the ListBoxItem is selected, show the treeview for that item.

 A ListBox can have a different ItemsTemplate for selected and not selected items.

Many choices here.

Thanks Karl I am going through the article. Suppose I could do the entire thing using ToolBar and Buttons, coding only in XAML. The properties will be similar i.e.  childnodes of only one button shall be viewable once at a time.

You have any resources for it ! It will be of immense help.