App is not installed in iOS 6.0 on XCode Simulator

I’ve changed my app’s MinimumOSVersion value in the build.settings from 7.0 to 6.0, but I’m unable to test for iOS 6.0 on the XCode 5.0 simulator.  

I have installed XCode’s iOS 6.0 simulator component so that the iOS 6.0 option appears in the XCode 5 simulator.   However, every time I build for the XCode simulator, the iOS 7 simulator comes up, and then when I switch it to iOS 6.0, the app is not installed on it.

Anyone know how to get it to work on the 6.0 sim?