def list_methods(interface):
    """
    List all explicit methods of `interface`, hidding methods that starts with '_'

    Parameters:
    ----------
    interface : interface of CST Studio

    Returns:
    ----------
    methods : array of string
        Explict methods of interface
    """
    methods = []

    for key in dir(interface):
        method = str(key)
        if not method.startswith('_'):
            methods.append(method)

    return methods