class_docstr: CompositePlot provides a baseclass for plots coordinate multiple
  subplots to form a Layout.
code: def _update_title(self, key):
      title = self._format_title(key) if self.show_title else ""
      if "title" in self.handles:
          self.handles["title"].set_text(title)
      elif (
          "axis" in self.handles
          and self.handles["axis"].figure is not None
      ):
          title = self.handles["axis"].set_title(
              title, **self._fontsize("title")
          )
          self.handles["title"] = title
  
imports: from contextlib import contextmanager
  from itertools import chain
  import matplotlib
  import numpy
  import param
  from matplotlib import animation, gridspec, pyplot, rcParams
  from matplotlib.font_manager import font_scalings
  from mpl_toolkits.mplot3d import Axes3D
  from ...core import AdjointLayout, Collator, CompositeOverlay, Element, Empty, GridMatrix, GridSpace, HoloMap, Layout, NdLayout
  from ...core.options import SkipRendering, Store
  from ...core.util import int_to_alpha, int_to_roman, wrap_tuple_streams
  from ..plot import DimensionedPlot, GenericAdjointLayoutPlot, GenericCompositePlot, GenericElementPlot, GenericLayoutPlot
  from ..util import attach_streams, collate, displayable
  from .util import compute_ratios, fix_aspect, get_old_rcparams
label_desc: Use image node_id 3 for calling the CompositePlot obj's underlying member method code with example usage: obj._update_title(key) without return types