Allows VARIANT-indexed access to items in the collection. You can use names as indexes as well.
| Name | Type | Description |
| Index | Variant | Input Variant value that specifies the ModelState to return. This can be either a numeric value indicating the index of the item in the collection or it can be a string indicating the ModelState name. If an out-of-range index or a name of a non-existent ModelState is provided, an error will occur. |