set_model
  
  Description:
  public void set_model (
TreeModel? model)
  
 
  
    Sets the model for a TreeView.
     If the this already has a model set, it will remove it before setting the new model. If model 
      is null, then it will unset the old model.
    Parameters:
    
      
        | this | 
        
           A TreeView. 
         | 
      
      
        | model | 
        
           The model. 
         |