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Capture change of parent in TreeGrid

I attended the Michael Washington's online webinar last week which was very inspiring, and consequently I've spent the day today playing with the Syncfusion Server Side Blazor components and in particular TreeGrid.  So far I am am loving them!!

One question though... Is there an event to detect when the parent for a tree grid row has been changed?  I have a requirement to update the parent field in the database, but I can't find an easy way to detect if a hierarchy change has been made.  I have a couple of cumbersome ways to achieve this e.g. adding a second (OldParent) property and looking for differences between the datasource and the dropped item in the ActionCompleteHandler, but I'm sure there must be an easier way.  I have found the RowDropped event (which incidentally is not currently documented), but this in itself doesn't provide an elegant solution.

Best regards

Ian McHugh