[Admins]

For the tree view you set attributes like this:

sortmode = "value";
sortorder = "descending";
groupsortorder = "ascending";

For the nodes then:

sortvalue = 1;
sortgroup = 2;

That would sort the nodes after the value you have assigned to them. When you set sortmode="name" then it will be sorted alphabetically. The sort group can be used to let some types of nodes always appear at the top, e.g. in a folder view you would want to display the folders at the top.