ComboBox - how to set the focus on the list selector


I have a simple ComboBox with some items. When I call SetFocus() the focus is set to the TextEntry but I need to set the focus to the dropdown list selector (the button with arrow). Is there any dedicated function to do this? I can get this using Navigate() method but it seems to be a workaround.


How about Popup method?
The drop-down list will appear and behave as if you set the focus on the button.