MultiGrid
---------------

Decorates `Grid` and adds fixed columns and/or rows.
This is already possible using `ScrollSync` and 2 or more `Grid`s but `MultiGrid` reduces the boilerplate.

The majority of `MultiGrid` properties (eg `cellRenderer`) are relayed to all child `Grid`s.
Some properties (eg `columnCount`, `rowCount`) are adjusted slightly to supported fixed rows and columns.

### Prop Types
| Property | Type | Required? | Description |
|:---|:---|:---:|:---|
| fixedColumnCount | number |  | Number of fixed columns; defaults to `0` |
| fixedRowCount | number |  | Number of fixed rows; defaults to `0` |
| style | object |  | Optional custom inline style to attach to root `MultiGrid` element. |
| styleBottomLeftGrid | object |  | Optional custom inline style to attach to bottom-left `Grid` element. |
| styleBottomRightGrid | object |  | Optional custom inline style to attach to bottom-right `Grid` element. |
| styleTopLeftGrid | object |  | Optional custom inline style to attach to top-left `Grid` element. |
| styleTopRightGrid | object |  | Optional custom inline style to attach to top-right `Grid` element. |

### Public Methods

##### forceUpdateGrids

Pass-thru that calls `forceUpdate` on all child `Grid`s.

##### measureAllCells

Pass-thru that calls `measureAllCells` on all child `Grid`s.

##### recomputeGridSize

Pass-thru that calls `recomputeGridSize` on all child `Grid`s.

### Examples

```jsx
import { MultiGrid } from 'react-virtualized'

function render () {
  return (
    <MultiGrid
      cellRenderer={cellRenderer}
      columnWidth={75}
      columnCount={50}
      fixedColumnCount={2}
      fixedRowCount={1}
      height={300}
      rowHeight={40}
      rowCount={100}
      width={width}
    />
  )
}
```