How to filter a PickTreeItem

[meindert]

Version: SmartClient Version: v8.3p_2012-11-23/Pro Deployment (built 2012-11-23)

I would like to filter the items in my PickTreeItem, what methode is there that I can use?

Something similar as the PickListFilterCriteria on normal select items would be great.

IPickTreeItem accountSelection = new IPickTreeItem() {  
            @Override  
            protected Criteria getPickListFilterCriteria() {  
                String category = (String) categoryItem.getValue();  
                Criteria criteria = new Criteria("category", category);  
                return criteria;  
            }  
        };