Edit xml file and bind to RadTree View Control?

[Medac]

Hi,

I have xml file. I need to append some child to the xml file. I have few questions regarding the same/

1. How to append the child be to the existing tree structure which is there in file. [This should not modify my initial xml file]
2. How to load this modified xml tree to the RadTreeView control?

Can anybody answer to  my two questions?

Thanks in advance,
Medac