Game Summary Screen Use of HorizontalScrollbox

I’m trying to create a fairly complex game summary screen with horizontal scrollbox and vertical scrollbox in the editor. However, I can’t get the boxes to display my entries beneath (contained) them. This should be cookie cutter easy. What am I doing wrong? Is there any in-depth documentation I can refer to?

The problem appeared to be my initial choice for the outer container (GridPanel). Now I have an outer VerticalBox, with a HorizontalBox for each line of information (and blank line) I’m displaying. Within each horizontal box I have spacers on each end and in betweem columns, and then a horizontal box with the actual data items.

The vertical box is set to a specific size, while each horizontal box is set to Fill with a percentage appropriate for the task at hand. For example:

GameSummary:
   Line1:
      LeftSpacerBox1:
      StatsBox1:
         Title:
         Value:
      MidSpacerBox1:
      ScoreBox1:
         Title:
         Value:
      RightSpacerBox1:

Vertical Box[Pos<40, 100>, Size<1840,400>
    Horizontal Box[Fill 1.0]
        Horizontal Box[Fill 0.25]
        Horizontal Box[Fill 0.50]
        Horizontal Box[Fill 0.25]
        Horizontal Box[Fill 0.50]
        Horizontal Box[Fill 0.25]