show/hide grid row via css

How can I toggle single grid row visibility? I can do
grid.selectStyle("","","",“display:none”) to hide selected rows, but how can I show them again?
setRowHidden() does not seem to be working in 3.6
Thank you.

setRowHidden() method should work correctly in 3.6 version.
If the problem still occurs for you please, provide with any kind of sample of your code with the init of your grid.