title: How to retrieve parent category when using grouped categories in Highcharts?
body: <p>I am using the grouped categories library here <a href="https://github.com/blacklabel/grouped_categories" rel="nofollow">https://github.com/blacklabel/grouped_categories</a>. How would I retrieve a parent category? For example, how would I get/return the category "Fruit" from the graph here: <a href="http://blacklabel.github.io/grouped_categories/" rel="nofollow">http://blacklabel.github.io/grouped_categories/</a>. I have tried this.x which returns both the parent and subcategories of a point. this.category.name would return the subcategory, or "Apple" in the example.</p>