button on ListGrid group summary

please can you provide me with an example of how to add a button on a group row

i have a list grid that is grouped on field1 and on field6 i have a button widget that allows user to add to another listgrid on the screen but the button doesnt show on the grouping row i would like an example on how to add a button to the group row on field6 to allow the user to add all the items in the group

i have done plenty of research and all i saw is answers about using getGroupTitle() but that only changes the grouped field and not the field that i wanted please provide me with a sample code as i am not sure how to do this

i am using Google Chrome for the browser and the isomorphic library in my application server