TreeView control in WPF

Hi, I am new to WPF and got started with that.

I am developing a source code viewer, and trying to show the list of source files in a treeview,once double click the file, use should be able to see the text[Read Only]. To be honest I never worked with treeview controls in windows forms too.

Am I supposed to load all the files into program or recursively load from source files?

How can it be implemented??

Thanks