I\'m running a .Net 4.5 WPF application in Visual Studio 2015 Update 1 in a Debug build configuration.
In Tools > Options > Debugging > General I have checked Enable UI
Another thing that can cause this to fail is security common in a corporate environment. If the other solutions do not work for you (and your code is not already there), try moving your code to a location under your Documents folder. There are sometimes exceptions to security constraints on your Documents folder, and those security constraints can keep this feature from working.