Tree "Load on demand" operations with child element

Im using RadzenTree component with "Load on demand" - It works fine when I load data from database.
Now, I need change data (remove, add, edit) in tree with external buttons, but in Data variable deps I see only root elements, all childs elements is closed.
How I can do it?

<RadzenTree @ref="tree" Data="deps" Expand=@LoadDeps @bind-Value=@selection Change=@OnChange>