Checkers Tutorial in 1.7.2 - networking

I've been trying to do the checkers tutorial with version 1.7.2 and have gotten to step 2 where you're supposed to be able to test the networking after adding "Canvas.pushDialog(NetworkMenu);" to the onStartUp function and "$Game::UsesNetwork = true;" to the common.cs script. When I start the game, the network menu never comes up and I'd like to know why if anyone can help me out.

here's what I have for the onStartUp:

function onStartUp()
{
$mainScreen = mainScreenGui;
$mouseObj = new t2dSceneObject() {sceneGraph = $checkersScene;};

$none = 0;
$red = 1;
$blue = 2;
$redKing = 3;
$blueKing = 4;

$true = 1;
$false = 0;

$no = 0;
$yes = 1;

function redChecker::onLevelLoaded(%this, %scenegraph)
{
$redChecker = %this;
}

function blueChecker::onLevelLoaded(%this, %scenegraph)
{
$blueChecker = %this;
}

Canvas.pushDialog(NetworkMenu);
}