HierarchyLevelNode.sortChildren Method
        
 Sorts the children of this instance by their text.
 
         
        Parameters
        
            - isAscending
            
 
            - 
                
Type: Boolean
If true then sort in ascending order; otherwise sort in descending order. 
            - predicate
            
 
            - 
                
Type: Function - May be null
The sort predicate to use. 
            - recursive
            
 
            - 
                
Type: Boolean
(optional) Whether or not the sort should recursively sort (all children's children).
Optional: True