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serializeToCSV Export All Rows

I'm trying to use serializeToCSV to export the rows but the problem I'm running in to is that it only exports the rows that are uncollapsed. Even if I expand the rows and then collapse them it still will only export the rows that are expanded. Ideally, i would like to export the rows except ones that are filtered. Is there a way to get it to do this?

It also inserts hidden columns in to this csv file. Is there an option not to export those?

>>I'm running in to is that it only exports the rows that are uncollapsed.
This is expected behavior for TreeGrid ( cvs can't store info about hierarchy in any case)
You can try to use
    grid.expandAll();
    var csv=grid.serializeToCSV();
    grid.collapseAll();

>>It also inserts hidden columns in to this csv file. Is there an option not to export those?
You can configure , which columns to serialize by 
             grid.setSerializableColumns("true,true,false"); //parameter - list of flags for columns