The Device panel is the one that allows you to change the current theme and color of the phone in the artboard. To bring the Device panel into view, you need to select it from the Windows menu.
Three controls that can be added to a form to add visual feedback are:
When you apply a built-in (system) style to a control, you're guaranteed that when the user changes their theme and accent color settings, your application will fit right in. System styles will closely match other applications on the phone, conforming to Microsoft's “Metro” design guidelines.
Cartoonists have known about easing since the early days of Mickey Mouse. By applying an appropriate type (ease in, ease out or both) and strength of easing, you can make animations look much more natural. The best animations are the ones that users don't even notice.
Option a is the answer. New Sample Data will let you design a simple data class that Blend will create some sample instances of. This is good for prototyping because it's the quickest way to get something visible on the screen, but doesn't work with real production objects.