ok, I did the following:

$(“#mygrid”).expandSubGridRow(rowid);

Which worked when the grid was not open. However it did not reload it. So instead I used these together:

$(“#mygrid”).toggleSubGridRow(rowid);

$(“#mygrid”).expandSubGridRow(rowid);

This way, if the grid is open, the first line closes it and the second reloads it. If the grid is closed, the the first line opens and reloads it and the second line is ignored.

by the same logic, to close the grid without knowing if it is open or not, I used:

$(“#mygrid”).expandSubGridRow(rowid);