Hello,

You have a lot of choices depending on your requirements.

1. You can expand all subgrid rows after reloading, sorting, paging and etc if you use the grid option reloadOnExpand in subgrid options. This is documented here

2. You can expand or collapse a particular row by ID using the appropriate method (after the data is loaded). All these methods are documented here.

In your case this is a method expandSubGridRow( row_id )

Kind Regards

Will