I'm using the knockout extensions, and I'm having three problems. I have a grid with three levels, and I'm using 2012.1.2049 with jquery 1.7.2, jquery ui 1.8.18 and knockout 2.1.0. The first problem is that I'm getting a "Stop running this script?" message in IE 8 when the page loads. The second problem is that when I expand the first level, I get an error in Visual Studio (Microsoft JScript runtime error 'm.columns[...].key' is null or not an object). And third, when I expand the second level, I get an error in Visual Studio that says (Microsoft JScript runtime error 'this.root().schema().schema' is null or not an object). I've linked to a sample project displaying these errors in the /Main/HGrid view. Any ideas on how to fix them would be appreciated..

https://docs.google.com/open?id=0BxeJN0nNEVEbbVRYV1FEU2lOTU0