-- ftd.column:

--- foo:

--- ftd.text: Hello




-- ftd.column foo:
append-at: col-id
open: true
boolean open-1: false

--- ftd.text: Click
$on-click$: toggle $open-1

--- ftd.column:
if: $open-1

--- ftd.column:

--- ftd.column:

--- ftd.column:
id: col-id