unset_rows_drag_source
Description:
public void unset_rows_drag_source ()
  
  Undoes the effect of enable_model_drag_source.
Calling this method sets reorderable to false.
Parameters:
| this | 
           a TreeView  | 
      
Undoes the effect of enable_model_drag_source.
Calling this method sets reorderable to false.
| this | 
           a TreeView  |