CngxDataGridRow

A disclosure row in a CngxDataGridAccordion. Renders the APG-correct trio: a role="heading" wrapper carrying the group's aria-level, a cngxAccordionPanel summary <button> that is the full-row disclosure trigger, and a role="region" detail zone named back at the primary cell via aria-labelledby. Expansion is derived from the coordinator (Pillar 1); the button self-wires keyboard nav through the registration brain, so arrow keys rove across rows even though each summary lives in its own component view.

The projected cngxDgaCells are laid OVER the trigger, not inside it: a <button> accepts phrasing content only, so a cell holding flow content (a chart, a table, a nested list) could never live in the button. The cells share the button's grid row, painted above it, and are pointer-events: none, so a click on a passive cell falls through to the trigger and toggles the row, while interactive cell content (a link, a control) re-enables its own clicks. The cell marked primary supplies the row's accessible name through the button's aria-labelledby (falling back to the whole cells row when none is marked), so a screen reader hears a list of expandable sections rather than a wall of cell text.

https://cngxjs.github.io/cngx/examples/#/ui/data-grid-accordion/master-detail https://cngxjs.github.io/cngx/examples/#/ui/data-grid-accordion/report https://cngxjs.github.io/cngx/examples/#/ui/data-grid-accordion/lazy-row