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I am using a custom engine with the ggc. I have a couple of summary rows above header row. I keep getting a NullReferenceException error when I make a edit a cell in the grid that would cause the summary row to autocalc.
The error occurs in the method below at the last line (el.ParentGroup.IsExpanded).
public override bool IsChildVisible(Element el) { if (el is ExtraSection) return el.ParentGroup.IsExpanded; // here you can specify when the extra section is visible.
else if (el is CaptionSection) return true;
else return el.ParentGroup.IsExpanded; }
When I add a null check in this method I noticed that the summary row was not auto-calcing... so definitely something is wrong. The culprint turns out to the the OptimizeGrid method, which I copied from one of your samples.