docstr: Triggers update to a plot on a refresh event
docstr_tok: ["Triggers","update","to","a","plot","on","a","refresh","event"]
code: def _trigger_refresh(self, key):
      "Triggers update to a plot on a refresh event"
      if self.top_level:
          self.update(key)
      else:
          self.current_key = None
          self.current_frame = None
  
imports: import param
  from holoviews.plotting.util import attach_streams
  from ...core import AdjointLayout, Empty, GridMatrix, GridSpace, HoloMap, NdLayout
  from ...core.options import Store
  from ...core.util import wrap_tuple
  from ...element import Histogram
  from ..plot import CallbackPlot, DimensionedPlot, GenericAdjointLayoutPlot, GenericCompositePlot, GenericElementPlot, GenericLayoutPlot
  from .util import configure_matching_axes_from_dims, figure_grid
label_desc: Use image node_id 2 for calling the PlotlyPlot obj's underlying member method code with example usage: obj._trigger_refresh(key) without return types