I haven't been able to render a custom cell for the column that's housing the expandable cells. If I set `cell` to `CustomCell`, the expandability (the carrot dropdowns) disappears. I couldn't find an example in the docs that showed the actual expandable cells getting rendered custom (just the regular cells with values) - could you please show me a simple example to get me on the right track? Is it that I should build the expandable carrots into the custom cell myself or did I miss something in the docs?
Thank you!