from PySide6.QtWidgets import QApplication, QComboBox, QVBoxLayout,QWidget
from PySide6.QtGui import QStandardItemModel, QStandardItem
from PySide6.QtCore import Qt

if __name__ == "__main__":
    app = QApplication([])

    model = QStandardItemModel()
    items = ['Option 1', 'Option 2', 'Option 3', 'Option 4']
    for row, item_text in enumerate(items):
        item = QStandardItem(item_text)
        item.setFlags(Qt.ItemIsUserCheckable | Qt.ItemIsEnabled)  # Enable the checkbox
        item.setData(Qt.Unchecked, Qt.CheckStateRole)  # Default to unchecked
        model.setItem(row, 0, item)
    
    container = QWidget()
    layout = QVBoxLayout()
    container.setLayout(layout)

    combo = QComboBox()
    combo.setModel(model)
    layout.addWidget(combo)

    container.show()
    app.exec()