I start with a List Widget and set under the "Content" tab in the "States" section the background fill color to, for example, green. Then I add a Button Widget to the List Widget. For the button, under the "Content" tab in the "Advanced" section, I can successfully change the background fill color of the button from white to, for example, red. Next, I try setting the background fill color of the button to clear, but the button just appears to be white. It does not appear green like the List Widget it is in. The background fill color under the "Style" tab is also set to clear by default, so is there somewhere else something needs to be set?