I just put in an image for a new button. This image is for both when the button is not selected and when it is. However, when I go to run my app on a device, I see a blue ellipse in the image's place. To make matters worse, I can't find any reference to an ellipse anywhere within my project. The image is a PNG file, and it renders correctly on my computer. Will someone please tell me how to fix this? Thanks.