get_child_by_index
  
  Description:
  public abstract Object? 
get_child_by_index (
uint index)
  
 
  
    Fetches a child by its number.
    Parameters:
    
      
        | this | 
        
           the parent object to get the child from 
         | 
      
      
        | index | 
        
           the child's position in the child list 
         | 
      
    
    Returns:
    
      
        | 
           the child object or null if  not found (index too high). 
         |