panel.setAllowsMultipleSelection_(False)
panel.beginSheetForDirectory_file_types_modalForWindow_modalDelegate_didEndSelector_contextInfo_(
None, None, [], self.window, self, self.selectFolderEnd_returnCode_contextInfo_, None)
panel.setAllowsMultipleSelection_(False)
panel.beginSheetForDirectory_file_types_modalForWindow_modalDelegate_didEndSelector_contextInfo_(
None, None, [], self.window, self, self.selectFolderEnd_returnCode_contextInfo_, None)