How can I render rows programatically?

How can I render rows programatically?  I am using the grid and I would like to render row 50 even though the row wasn’t set to be rendered initially?  I cannot use enableSmartXMLParsing b/c I am not using the tree grid and I don’t want to render all rows due to performance issues.  Is there any way around this?  I want to render only what I need and then would like to render rows programatically when needed. 

and I don’t want to render all rows due to performance issues
The plain grid supports smart rendering mode.
dhtmlx.com/docs/products/dht … 5531587000

Mode works for both Grid and TreeGrid.