Can not get the list of shapes in a shape group from Excel? Is there a solution?

[koushou6]

Can not get the list of shapes in a shape group from Excel? Is there a solution?
`
if (drawing is XSSFDrawing xdrawing)
{

foreach (var shape in xdrawing.GetShapes())
{
    if (shape is XSSFSimpleShape simpleShape)
    {
          ......
    }
    else if (shape is XSSFGraphicFrame groupFrame)
    {
          ......
    }
    else if (shape is XSSFShapeGroup groupShape)
    {
          ????
    }
}

}`

[tonyqus]

what's the purpose of iterating this?