I have been looking through the Ignite UI examples but haven't been able to get this working.
After much trial and error, it appears that hierarchical binding works when you create a view with Html.Infragistics().Grid() for an action returning JSON.Also, hierarchical binding works when binding using Ajax to a URL returning JSON. (very slow to draw.. looks like it expands each branch individually)
However, I never was able to get hierarchical binding working using .DataSourceUrl method of Html.Infragistics().Grid(). I could display the top level but expanding out any of the lower branches always gave the error listed above.
Hopefully this saves someone else some experimenting. It would be helpful to have more working examples of different ways to bind the Grid control.
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