I can see that many widgets have an alpha channel, but there seems to be none for others, such as the Combo widget (would be very helpful for me); is there any particular reason for that...?


Combo widget does not support background color property so there is no alpha channel. However this feature is on my list and I added your vote to it. Let me know what other widgets you think should have background property.

Well, thanks! :) In my case at least I don't need this feature for other widgets right now, but I guess it would be nice in general to have it for any widget that does have some kind of background (like Button, Accordion, etc.).