Trying to Add one more Child in GetContent() in Task node

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I follow a CustomGrid_ContentManager From an SGGraph Example. Here Below the Function for getting content from the feed.

sub GetContent()
    feed = ReadAsciiFile("pkg:/images/Response.json")
    if feed.Len() > 0
        json = ParseJson(feed)
        if json <> invalid and json.rows <> invalid and json.rows.Count() > 0
            rootChildren = {
                children: []
            }
           for each row in json.rows
               if row.items <> invalid
                   rowAA = {
                       children: []
                   }
                 for each item in row.items
                     rowAA.children.Push(item)
                end for
                rowAA.Append({ title: row.title })
               rootChildren.children.Push(rowAA)
            end if
       end for
       m.top.content.Update(rootChildren)
      end if
   end if
end sub

And I access the response using the MainScene like below :

m.grid.content.GetChild(0).GetChild(0)

Here, I’m trying to Add a one more child in GetContent() and access using in main scene like below.

m.grid.content.GetChild(0).GetChild(0).GetChild(0)

But no luck. It’s everytime found invalid Data. I’m trying using the below code for . Does anyone give a suggestion how to do this?

sub GetContent()
    feed = ReadAsciiFile("pkg:/images/Response.json")
    if feed.Len() > 0
        json = ParseJson(feed)
        if json <> invalid and json.rows <> invalid and json.rows.Count() > 0
            rootChildren = {
                children: []
            }
            ' 'First Way Here I added extra Node 
            ' rowNode = {
            ' children: []
            ' }

            ' 'Second Way Here I added extra Node 
            ' rootChildren = {
            '     children: {
            '       rowNode : []
            '     }
            ' }

           for each row in json.rows
               if row.items <> invalid
                   rowAA = {
                       children: []
                   }
                 for each item in row.items
                    'First way using a for loop
                    ' for each nik in item.items
                    '     rowNode.children.Push(nik)
                    ' end for
                    ' rowAA.children.Push(rowNode) ' But Here not maintain item value for first node

                    ' 'Second way I tried with directly addd
                    ' rootChildren.children.rowNode.Push(item.items) 'But here It's give and error
                     rowAA.children.Push(item)
                end for
                rowAA.Append({ title: row.title }) 'Here Second Way It's give a error not update data here
               rootChildren.children.Push(rowAA)
            end if
       end for
       m.top.content.Update(rootChildren)
      end if
   end if
end sub