Hi Alexey,
Thank you for your interest in Syncfusion Products
The Tree View can be bounded with Object DataSource. I'm afraid that I’m not able to reproduce the issue reported by you. Kindly refer the sample in the below link in which the Tree View is data bounded using a Object Data Source.
http://samples.syncfusion.com/aspnet/7.4.0.20/web/tools.web/samples/3.5/TreePackage/TreeView-%20Advanced%20Features/DataBinding/cs/TreeViewDataBinding.aspx?args=1Please let us know if any concerns.
Regards,
Lakxman Kumar C