OK. eventually i got everything works for drag and drop. The trick is I have
to remove the dragged column, then insert it again with preferred index
TableView.ColumnSequence tc =
tableViewHeader.getTableView().getColumns();
TableView.Column col0 =
tableViewHeader.getTableView().getColumns().get(dragIndex);
tc.remove(col0);
tc.insert(col0, selectedIndex);
Where the dragIndex is a static parameter which got its value from
DragSource.
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