I have a menu that I’ve been asked to style so that the items have rounded corners… basically so that they look like buttons.
I want to change the black background behind the sub-menu so that it’s transparent. White would be OK too.
This black isn’t the border of the child item’s buttons as I can set that to yellow and I see a slight yellow border but still see the black background.
I changed all the instances of black to purple as a test and still got this black background. So I can’t tell where it’s coming from.
Thanks.

Success! In order for the Popup’s Border’s background to be transparent you need to set AllowsTransparency=”True” on the Popup element.