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TreeGrid.setData(Tree) question

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SmartClient Version: v9.1p_2014-03-20/PowerEdition Deployment (built 2014-03-20)
GWT 2.5.1
IE-11

I followed the example on the Isomorphic Wiki on doing refreshes with a ListGrid using the DataSource to fetch and then doing a listgrid.setData().

I'm seeing instances of ListGridRecord(s) being accumulated with every TreeGrid.setData(Tree). With a fixed data set of 22k compressed being sent every time, after 70 refreshes the browser falls over and hangs.

Should I be clearing the TreeGrid first before doing a TreeGrid.setData(Tree)?

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