I started using RadTreeView, so I added XAML reference and tree to page, and corresponding collection in viewmodel.
After add Item to collection I got exception as below:
05-22 14:54:25.831 E/mono-rt ( 4107): [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object.
TreeView need to create nested ViewModel containing items source collection.
Lance | Manager Technical Support
answered on 22 May 2018, 07:08 PM
I'm glad you were able to find a solution. You're correct, there should be an item adapter that tells the TreeView where to get the nested items, which are typically located within the same model definition. Take a look at the Getting Started Example for more guidance.
Lance | Tech Support Engineer, Sr.
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