import java.util.*;
  
  WindowContext context = argObj("windowContext");
  Tree tree = context.get("/tabs/Edit User/userTree");
  NodeInfo root = (NodeInfo)tree.getModel().getRoot();

  root.removeAllChildren();
  tree.setRootVisible(false);
  tree.setShowsRootHandles(true);
  tree.setCellRenderer(new IconicCellRenderer("images/user.gif"));
  
  DB db = context.get("db");
  DB.Result users = db.execute("select * from mysql.user order by user, host");
    
  List userList = new ArrayList(users.size());
  
  for (HashObject ho: users)
  {
     userList.add(ho.get("user") + "@" + ho.get("host"));
  }
  
  TreeUtils.populateList(root, userList, "user");
  tree.updateUI();