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If you want to open the first parent node, you can achieve it by doing this -
var obj:Object =
Similarly, you can open all the parent nodes of the collection.
I can't seem to get this to work.... I copied your exact code into my script, and, it compiles without a problem, but, when I run the application in a browser, I get the following runtime error:
"TypeError: Error #1034: Type Coercion failed: cannot convert mx.collections::HierarchicalData@ab3fba1 to mx.collections.HierarchicalCollectionView."
Then you have to wait for the next release because AdvancedDataGrid.dataProvider returns IHierarchicalCollectionView in the latest version.
When will this be available? I am currently running M2 Beta 1 Release (Version 3.0.172437). Is there an M3 Release available? I have not been able to find this on the Adobe website. Also, the last time I tried using a nightly build, the ADG feature no longer worked.