code: def _getWidget(param):
      return list(param.items.keys())[0].widget
  
file_path: pyqtgraph/tests/parametertree/test_parametertypes.py
imports: from unittest.mock import MagicMock
  import numpy
  import pyqtgraph
  import pyqtgraph.parametertree
  from pyqtgraph.functions import eq
  from pyqtgraph.parametertree.parameterTypes import ChecklistParameterItem
  from pyqtgraph.Qt import QtCore, QtGui
label_desc: Use image node_id 1 for calling a global function with example usage: _getWidget(param) and returns: list