Required library edition: 
 Required library file: dhtmlxgrid_drag.js
sets Drag-And-Drop behavior
 mode - behavior name
  child - the item is dropped as a child of the target item;
 
  sibling - the item is dropped as a sibling of the target item; if drop occurs between the parent and the child elements, the item is moved on the parent level;
 
  complex - the item is dropped as a sibling or a child depending on the position of the target item towards the landing; if drop occurs between the parent and the child elements, the item is moved on the parent level;
 
  sibling-next - the item is dropped as a sibling of the target; if drop occurs between the parent and the child elements, the item is moved on the child level;
 
  complex-next - the item is dropped as a sibling or a child depending on the position of the target item towards the landing; if drop occurs between the parent and the child elements, the item is moved on the child level.
 
 
   mygrid.setDragBehavior(sibling);
See also: setDragText