1 | root | The box around every panel: border, radius and background. bordered and ghost change it here. |
2 | header | One panel's clickable row, from the item's label. It toggles the panel, and an extra node sits at its end. |
3 | icon | The expand arrow. It rotates when the panel opens, expandIcon replaces it, and expandIconPlacement moves it to the end. |
4 | title | The header's text, which takes the free width. |
5 | body | The panel's content, from the item's children. It renders the first time the panel opens, unless forceRender is set. |