Matrix Forms

Does anyone have any documentation on creating Matrix Forms? We’re still on 2.6 and the only reference in our Application Designers Guide is a screen shot of the toolbox…and it shows the Matrix Form icon as “not in use”! Right now I’m just shooting in the dark. Thanks in advance.

In the C/AL Online-Help select “Controls” and then "M"atrix Box.

Help doens’t help on MatrixBoxes. I learned it from G/L Budget and Dimension compare example.