I've got a bunch of records whose names are like "Itemtype #", and when they are outputted into a tree view, they're sorted incorrectly, like so:

* Item 1
* Item 10
* Item 11
* Item 12
* Item 13
* Item 2
* Item 3
* Item 4

My model fields are defined as follows, and I am sorting on "Name":

```
fields: [
  { name: 'Id', defaultValue: 0, type: 'int', mapping: 'Id' },
  { name: 'Name', defaultValue: '', type: 'string', mapping: 'Name', sortType: Ext.data.SortTypes.asUCString },
  { name: 'Type', defaultValue: 0, type: 'int', mapping: 'Type' },
  { name: 'CreationDate', type: 'date', mapping: 'CreationDate' }
],

```

Can anybody point me in the right direction? I'm using extjs 4.0.5