Hello Hussein,

I am just checking if you require any further assistance on the matter.

Hi Hussein,

Thank you for your post. I have been looking into your requirement and this functionality is not available built-in. You can achieve a similar behavior by re-templating the default template for the XamDataTreeNodeControl. You could find it in:

 C:\Program Files (x86)\Infragistics\2015.1\WPF\DefaultStyles\DataTree\generic.xaml

I am attaching a sample application(DataTreeSelectedNode.zip) that shows a possible approach on how to achieve the desired functionality.

Let me know, if you need any further assistance on this matter.