I want to create a cell that as this basic format:

```
|-----------------------------|
| column  |                   |
|  e1     | Expand (RichText) |
|  e2     |                   |
|  expand |                   |
|-----------------------------|

```

I have the following code to do this:

```
  Widget build(BuildContext context) {
    return new Container(
      decoration: new BoxDecoration(border: new Border.all(width: 2.0)),
      child: new Row(
        children: <Widget>[
          new Container(
            width: 80.0,
            child: new Column(
              children: <Widget>[
                new Container(color: Colors.red, height: 10.0),
                new Container(color: Colors.blue, height: 50.0,),
                // new Expanded(
                //   child: new Container(color: Colors.amber),
                // )
              ],
            ), 
          ),
          new Expanded(
            child: new Padding(
              padding: new EdgeInsets.all(20.0),
              child: new Text(widget.message)
            )
          )
        ],
      ),
    );
  }

```

But I'm getting the following error out of Flutter:
RenderFlex children have non-zero flex but incoming height constraints are unbounded.

Is there a way to have that last expanded in the left most column take up as much room as it needs given the size of the RichText on the right and side?