Selecting Group Level Row On Selecting All Event On Ui-grid

I am trying to react on event when user clicks on select all event on header of ui-grid. All rows do get selected, which is expected behavior, but high level group rows are not sel

Solution 1:

As per the documentation HERE

Group header rows cannot be edited, and if using the selection feature, cannot be selected. They can, however, be exported.

Have a look at the below screen shot which is taken from Complex grouping found here