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serializeToCSV only Exports Expanded Rows

When i call serializeToCSV on my TreeGrid it will only export the currently expanded rows. If I expand a row so that it renders, close it and then try serializeToCSV it still won't grab those collapsed rows. Is there a way to make it export all the rows?

CSV serialization is purposed for plain grids only. 
http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&page=1&q=6482&ssr=yes&s=serialize%20csv%20treegrid