adding butting to drop down Item of QComboBox

Attachment 9752
How do I have a button like shown in the image below "Other" that it stays there even if number of items continues to increase.
Attachment 9753

I see a couple of options:

- insert new entries before the last one
- use your own list model and ensure that the "Other" entry is always the last
- use your own view (QComboBox::setView) and let it show the entry additional to the items in the model

Cheers,
_