title: How to prevent Visual Studio to prompt to upgrade projects .NET 4 to .NET 4.5
body: <p>I have a solution in with project in C#, C++/CLI targeted to .NET 4 and with some dependencies in .NET4. When I open this solution in Visual Studio 2013 it prompts for upgrading the solution. Some developers in our remote teams don't read the messagebox and just press OK. The dependencies are not compatible after project upgrade and then they are mailing me that the solution cannot be built.</p>
  
  <p><a href="https://i.stack.imgur.com/8lO0o.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8lO0o.png" alt="upggradeVCplusplus"></a></p>
  
  <p>Is there some way to turn off this prompts for .NET Framework upgrade?</p>