Rows in any grid can be rearranged by drag and drop.
This is done by:
dropModel.diHelperspecifies the displayed columns in the draggable helper.
dropModel.dropmoves the rows. You can override it to do custom action upon drop of rows.
First of all mutiple row selection is turned on or checkbox selection is turned on.
dragModel.dragNodes method is implemented to return array of selected or checked rows.