How can i find the predefined button class Windows 8 apps using JavaScript?For example \[code\] <button id="playlistBackButton" class="win-backbutton">Back</button> \[/code\]"win-backbutton" it is a predefined Back button class . I need all other predefined buttons class like Next,play, previous buttons. I searched my hole project but i can't find the class. Is anyone know Where is the button class located ?