Detection of expanded rows and programatically expanding rows

TJ14

Is there a way to
1.) Detect which rows are currently expanded.
2.) Expand those rows again later programmatically.

I want to save which rows are expanded, then redraw the table and then re-expand the rows after the redraw. For this I'll of course need to grab some kind of data from the row so I can reference it later.

TJ14

I have actually figured out what to do for detecting currently expanded rows. I just need to know if there is a way to invoke the expand on the row programmatically.