In many cases, tree or treegrid need to be built from multiple tables. Each table represent separate level of tree or treegrid. For tree it can be done as

	require("../../codebase/treemultitable_connector.php");
 
 
	$tree = new TreeMultitableConnector($res);
	$tree->setMaxLevel(3);
	$level = $tree->get_level();
 
	switch ($level) {
		case 0:
			$tree->render_table("projects2","project_id","project_name","","");
			break;
		case 1:
			$tree->render_sql("SELECT teams2.team_id, teams2.team_name, project_team2.project_id FROM teams2 INNER JOIN project_team2 ON teams2.team_id=project_team2.team_id", "team_id", "team_name", "", "project_id");
			break;
		case 2:
			$tree->render_table("developers2", "developer_id", "developer_name", "", "developer_team");
			break;
		case 3:
			$tree->render_table("phones2", "phone_id", "phone", "", "phone_developer");
			break;
	}

Multi-table connector will work only for tree|treegrid with dyn. loading mode enabled

Similar code can be used for treegrid , the only difference in the connector class

	require("../../codebase/treegridmultitable_connector.php");
 
	$treegrid = new TreeGridMultitableConnector($res);
	$treegrid->setMaxLevel(3);
	$level = $treegrid->get_level();
 
        ...