I'm trying to create a stacked page with the Panels module, using flexible layouts. It should look like this:
How can I do this?
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Simply add 3 rows in the flexible layout by clicking 'Column' > 'Add row to top/bottom' in the layout designer to stack the page. Add fluid or fixed regions afterwards in every row.
(Special thanks to @Letharion!)
You can also achieve this without the flexible layouts and do it programatically like @Andrew Welch said. This video can help you in doing that.
You need to create a panels layout. You can find these in the panels module in the layouts folder. I believe you can then create a layouts folder in your theme and copy a layout in there, and work on it. Layouts are simply an includes file with an array of options, a template file, and a thumbnail image.