def METHOD_NAME(self):
    """
    function to display ROI Transfer window when
    ROI Transfer button is clicked.
    """
    self.roi_transfer_option_pop_up_window = ROITransferOptionUI()
    self.roi_transfer_option_pop_up_window. \
        signal_roi_transferred_to_moving_container \
        .connect(self.moving_dict_structure_modified_function)
    self.roi_transfer_option_pop_up_window. \
        signal_roi_transferred_to_fixed_container \
        .connect(self.fixed_dict_structure_modified_function)
    self.roi_transfer_option_pop_up_window.show()