WebviewScaffold rendered Outside the Container

Hi i need help: **Webviewscaffold** rendered outside the **Container**
I'm trying to load string text into a **WebviewScaffold**, but the webview is outside the container :

I tested with Text widget it worked well

```
_getDescription(description) {
return new Container(
child:
//new Text(description),
new WebviewScaffold(
url: new Uri.dataFromString(description, mimeType: 'text/html',encoding: utf8).toString()),
width: double.infinity,
margin: new EdgeInsets.only(top: 10.0),
height: 80,

);
}
```
the full Class:

```
child: new ListView(
children: [
new Hero(
tag: _title,
child: _getImageNetwork(Functions.getImgResizeUrl(_img,250,''))
),
_getBody(_title,_date,_description,_origin,context),
],
),

Widget _getBody(tittle,date,description,origin,context){

return new Container(
margin: new EdgeInsets.all(15.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
_getTittle(tittle), //Text Widget
_getDate(date,origin), //Text Widget
_getDescription(description),
_getAntLink(),
_getLink(_link,context)
],
),
);
}
```
there is a warning in the Flutter WebView Plugin Docs :

> Warning: The webview is not integrated in the widget tree, it is a native view on top of the flutter view. you won't be able to use snackbars, dialogs ...

is this real reason of the problem?

Please Help!!