Re-creat it. That's the only way. Right click on your panel button and press "save image pressed" and save it and do the same and press "save image released" then go to the page you want to creat button and press "Alt + B" and a new button comes up. From there, left click on the button and it comes up with the "Button Property" then, go to appearence and insert the "released" and "pressed" image of the button, and from there you have a button.