New in version 1.1.
Get first instance of klass in proper parentage of component:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> componenttools.get_first_instance_of_klass_in_proper_parentage_of_component(staff[0], Staff)
Staff{4}
Return component or none.
Changed in version 2.0: renamed componenttools.get_first() to componenttools.get_first_instance_of_klass_in_proper_parentage_of_component().