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In TreeGrid, after drop class definitions clear

After I drop an object it's and all it's child object CSS class definitions are cleared out. Is there anyway to maintain the CSS for each cell after dropping it?

It not possible without code modification. In case of TreeGrid row recreated in new location, so its preserv values and userdata, but any other attributes assigned to it will be lost.
You can try to attach custom event handler to onDrop event and restore necessary cell styles from it.