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    Allow/prevent TreeGrid drop by record

    Using a TreeGrid, how can I intercept the record drop *before* the drop, so that:
    1. I can prevent the drop for nodes that do not accept dropping, and
    2. I can allow dropping for nodes that do accept dropping

    If this can be done, how do I control the icon shown to the user to indicate that the drop cannot be performed on a specific node?
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