start option automatically updates when you open the project.as per your project it will be updated,if you open windows 7.1 project then 4 type of emulators will be displayed in the list .if you open wp 8 project then there will be only start option. when you connects the phone device to computer in that list you will get device option by selecting it you will be able to run projects on your deice. unless you connect any device to computer IDE will not display device option.

Can you deploy XNA game application to WP8 in VS2012?
I've been building on iOS 7 for a while now but I've yet to get this solved, I have a number of views with autolayout enabled that were created in Storyboard and are displayed with a standard UINavigationController. The majority are fine, but the ones based on UICollectionView always place themselves under the navigation bar, unless I set the translucency to NO. I've tried the edgesExtended trick but that doesn't seem to solve it, I don't necessarily mind having the translucency off but I'd like to solve it cleaner. 
