Hi,
I can see that your Path value is incorrect. Could you please use some valid expression?
Example:
this.cmstreeview1.Path = "/CustomersOnly/%";
Moreover, are you using CMSTreeView as control or are you registering this control in your ASPX page template as web part with path to CMSTreeView web part (
~/CMSWebParts/Navigation/cmstreeview.ascx)?
If you are using CMSTreeView as control, please reload the control with true parameter.
Example:
this.cmstreeview1.Path = "/CustomersOnly/%";
this.cmstreeview1.ReloadData(true);
I hope this will help you.
Best regards,
Miro Remias.