Imagine a table with columns: id, product_id, product_category, quantity.
Imagine also a grid is defined on this with group_by set on product_category and the grid set to start in Summary mode.
So say there are 2 distinct product_category entries (“Books” and “Music”) showing in Summary, if you click “Books”, is there an easy way to determine this was clicked? Clearly there are no Ajax events configuration for Summary.