A drill down technique. Want to create a bar chart showing only "parent" bars -- but passing all the data for the "children" bars at the same time only setting their visibility to 'off', something I thought plotOptions.bar.visible might do for me, but doesn't. Don't want the blank space of just removing bar but leaving the category.

I put together a simple jsfiddle showing how I could do this with a lot of work of controlling the categories and data via JavaScript -- but think its a nice enough idea that you might want it in the library:

http://jsfiddle.net/Wp9hS/

A jsfiddle put together by Fusher shows the disappearing bar, but leaves the category: http://jsfiddle.net/smx7W/1/.