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Treegrid dynamic loading and expandAll problem

Hi!

expandAll() don't work on dynamic loading nodes

Please provide fix or some workaround solution.

It is known limitation, the TreeGrid can't load data for all branches dynamically ( each branch need to be loaded by separate xml request and such "mass loading" in the same time will cause problems ) 

If you need to have ability to expand all data, you can load all data at once, but use smart rendering mode to improve initial rendering time.