Flutter, How to handle the scroll of PDF Viewer when the parent has a long height with scroll?

I have a column include several widgets. This column is the parent and its children cause the column has scroll. On the other hand I used PDF View Plugin and its PdfVeiwer widget inside the column.

But I have a problem. If both of the PdfVeiwer and the Column widgets have scroll. I can not scroll the PDF pages and just the Column can scroll!

How should I solve this problem?

SingleChildScrollView(
  child: Column(
    children: <Widget>[
      ExpandablePanel(
        hasIcon: false,
        header: Container(
          height: 50.0,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              Icon(Icons.keyboard_arrow_down),
              Text('Title'),
            ],
          ),
        ),
        expanded: Container(
            padding: EdgeInsets.all(8.0),
            child: SizedBox(
              height: 500.0,
              child: PdfViewer(filePath: path),   
            )),
      ),

      //My Other widgets are here 

    ],
  ),
);