Hello Peter,

Thank you for your post.

I have been looking into it and the functionality that you are looking for. What I can suggest in order to be able to achieve this is to use the ExpandAll method of Records collection in XamTreeGrid. You can read more details about it from the following link from our online documentation: http://help.infragistics.com/doc/WPF/2015.1/CLR4.0/?page=InfragisticsWPF4.DataPresenter.v15.1~Infragistics.Windows.DataPresenter.RecordCollectionBase~ExpandAll.html

I created a short sample application based on your scenario to show you how you can achieve the functionality that you want. Please let me know if I am missing something about your scenario.

If you require any further assistance, please do not hesitate to ask