Manipulate ODS (to openoffice calc)

Hi all, I'm try to use ODS files in PHP. I managed insert tables, elements row, cell, text and contents. When i open a file in openoffice, The rows don't they count as inserted. The problem is when I insert the lines (tags table:row), they who don't appear. When clone some object its appears. Does anybody have an idea? Does anybody know some class what does it use ODS file? tanks ZED