IgbHierarchicalGrid - Incorrect results when filtering with the advancedFilteringExpressionsTree via JS

[asun114]

We are attempting to implement advanced filtering for the IgbHierarchicalGrid using JavaScript.
Our current approach is to create an IgbFilteringExpressionsTree in C#, convert it into a Dictionary that conforms to the format expected by JavaScript, and then pass it to the JavaScript method.
The IgbHierarchicalGrid filters correctly when the FilteringOperands within the IgbFilteringExpressionsTree do not contain any nested IgbFilteringExpressionsTree instances. However, when a nested IgbFilteringExpressionsTree is included, the inner expression tree appears to have no effect on the filtering results.
We would like to determine whether there is any additional handling or a specific format required when passing nested IgbFilteringExpressionsTree structures from C# to JavaScript.

simple.zip
In the sample

1. Run the sample.
2. Click the button name is "click this button to custom filter".
3. The row where the Artist is Ahmad Nazeri has been filtered out, but it should be displayed.