text: """Sample classes."""
  from __future__ import annotations
  
  from PyQt5.QtWidgets import QWidget
  
  from qute_style.widgets.styled_combobox import CheckableComboBox
  
  
  class TestComboBox(CheckableComboBox[int]):
      """Combobox that displays a list of sample items to be checked."""
  
      def __init__(self, parent: QWidget | None = None) -> None:
          """Create a new TestCombobox."""
          super().__init__(parent)
          self._default_text = "No selection."
  
          # Set the data for nine test items
          for idx in range(1, 10):
              text = f"New Item {idx}"
              self.addItem(text, idx, ":/svg_icons/delete_forever.svg")
  