Unwanted empty rows between data when using smart rendering

I am using smart rendering in dhtmlx grid, but when i scroll some empty rows are created and then other data rows are rendered…this is confusing users whether rows will render in sometime…but that empty row is unnecessary there…I have attached the screen shot and earsed data for compilance…

You are using custom height of row ( most probably it is result of styles modification )
To restore correct functionality - add the next command to the grid’s init


where N - height of the row ( integer )