set_model
Description:
Sets the model for a EntryCompletion.
If this already has a model set, it will remove it before setting the new model. If model is null, then it will unset the model.
Parameters:
| this | |
| model | 
           the TreeModel  | 
      
Sets the model for a EntryCompletion.
If this already has a model set, it will remove it before setting the new model. If model is null, then it will unset the model.
| this | |
| model | 
           the TreeModel  |