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var ddrow = new Ext.dd.DropTarget(Grid.getView().mainBody, {
            ddGroup : 'ddGroup',
            copy:false,
            notifyDrop : function(ddSource, e, data){
               
                var sm = Grid.getSelectionModel();
                var rows = sm.getSelections();
                var cindex = ddSource.getDragData(e).rowIndex;
                if (!this.copy){
                    for(i = 0; i < rows.length; i++) {
                        ds.remove(ds.getById(rows[i].id));
                    };
                };
                ds.insert(cindex,data.selections);
    
            }
});

grid 別忘了將 enableDragDrop設為true