1. I pas an instance of HierarchicalCollectionView to the dataProvider of my AdvancedDataGrid
2. The hierarchical data is displayed fine
3. expandItem() fails miserably:
TypeError: Error #1034: Type Coercion failed: cannot convert mx.collections::ArrayCollection@c9f6e81 to mx.collections.IHierarchicalCollectionView.
at mx.controls::AdvancedDataGrid/isItemOpen()[E:\dev\4.x\frameworks\projects\datavisualization\src\mx\controls\AdvancedDataGrid.as:4306]
at mx.controls::AdvancedDataGrid/expandItem()[E:\dev\4.x\frameworks\projects\datavisualization\src\mx\controls\AdvancedDataGrid.as:4391]
I'm using the HierarchicalCollectionView because it has the filterFunction property.